@Kacpa2
There's two things happening right now.
1. Classic games are being patched.
2. Classic games (SC1 confirmed) are getting remastered.
They have to do with each other, but they aren't the same thing. I think you're confusing the two.
If we follow Blizzard's model, the remaster is something separately bought. This means that anything done on the remaster does not affect the original game. So the artstyle and other things you mention that you don't want, don't change in the original game. They are only upgraded in the remaster for good. In the mean time, the classic games are also getting patched separately.
However, this doesn't mean it will split the community. Those on the remastered version WILL be able to play with those on the classic version online. Plus, if anything, the community gets bigger because of
1. Marketing and hype of the remaster boosts the player base
2. The original game going free boosts the player base
Speaking of SC1's model, I'm adding some news about it to the top regarding custom games
About compatibility i am not so sure if that would be possible in any way for Warcraft III, unless they plan to make it work as some kind of "Ultra" setting, mostly made with WoW assets or by using Armies of Azeroth team's work after paying them.
Base problem is that we're dealing here with much bigger game and community than Starcraft 1 ever was(it only has pro scene still strong mostly in asia), with it's own issues and most importantly 3D engine, that's borderline most important issue here. 'Paid' Higher resolution settings and sprites which work as ultra settings or official legal mod for a game are not as requiring and unsynchronizing thing.(tho with better FOV remaster players will have big advantage i guess) When it's something more than couple of sprites and little client and ui tweaks for higher resolutions it's rather easy, but when it's 3D everything changes. I doubt they would be capable of making remaster on old engine, especially with it's limited lighting capabilities(which tend to bug out causing "blackout" bug on low settings on big custom maps). Remasters for 2D classics, major patching for Warcraft III.
They cannot just apply same tactic here. There is literaly no custom scene for Starcraft 1, here we have it which is undeniably one of biggest things keeping Warcaft so well over the years and onwards.
So in case of Wc3 there may be a split, required by either change of the engine or too massive changes to it that would allow playing from both versions together.
They really just should patch current game, maybe prepare proper widescreen support(issues with gui dont reall allow that tho) and put of officially on sale on Battle.ne......ahmm...."Blizzard App" at lower price, add steamlike overlay for newer bnet. Aside from all this, also unlike Diablo II and Starcraft, Warcraft III isnt blurry pixelated mess, yeah models dont have too many polygons, but their art style holds them up well, while i couldnt say the same about Starcraft which is more akin to blurs of Warcraft 1 for some reason, zerglings arent even detailed, they look like single blob.
Warcraft III has none of this issues, it has others to be fixed tho, none of this will be fixed by remaster. And if we speak of 3d game like that, it only can be remade, unless all they will do is to force DX11 effects onto it, like peopel did for some other old games, adding tesselation and such, but it's unlikely, and would make it look odd, maybe even break the art style(on older game i seen it so far, stuff looks a bit uncanny with this shine, aside from lighting and effects). I'm concerned about this. I am not so sure about longevity of such boost you talk about too, what Starcraft has is most likely temporary, most people come back to relive it in singleplayer, play a bit on bnet and that's it. They will hop onto remaster then. In case of Warcraft i am not sure if compatibility is possible to such extend.
I would need to see how it turns out for Starcraft, but i'm still mostly against remaster for Warcraft III, it just raises too many questions and issues that are too hard to overcome for such small team working on classics, and it would really be much more than reusing old source material for couple of sprites and minor fixes and adjustments to resolutions and sound. I would rather have these two events mixed than forcefully made into one movement, especially when from all of these Warcraft III is one of it's kind there(only 3D classic). Time will tell....
EDIT: Just seen that improved Bnet for Starcraft Remaster. Maybe we couldnt get such Bnet improvements for Warcraft III?(even if it uses Bnet2.0, most of this could be moved for Bnet1.0)