I think you can drop most of those features and still make a great if not the best orpg ever made so far.
Things attachments and mounts are suggar not more. Even walkable houses, talksystem etc arent really neccessary. You really need:
Good Balance
- good balance throughout the whole game. Some hero might be better than another at certain stages of the game but no hero is better overall than another. Especially in the endgame everyone should be usefull.
- good balanced quests difficulty increasing slow but steadily, no quest is very hard to impossible without a certain hero
- good scaling with the number of players. Of cause you can choose a minimum amount of players but beyond that the difficulty should remain the same regardless of the amount of players.
Good Story/Questline
- there should be a good story motivating the players to do certain things (like quests, special events ...)
- here should be something new to do in every moment of gametime. Always a new quest to do, a new region to explore, new skills or items to be gained
- this should not be achieved by doing lots of repeatable grinding quests. Like you need level 35 to unlock the the next area but you are only 33 after doing all quests so you have to do the last "kill 25 of something" three more times.
- in fact i m not sure if locked areas and grinding quests cant be omitted all together, though you need to create other content then...
AND well I wanted to mention something else but lost it somewhere on the way
As you can see I think your ORPG mainly needs to be a good and fun game everything else comes later. Of cause a zoom-system wont hurt and attachments are nice to have, but if you dont feel like it you can still make an awesome orpg without them.
Just compare WC3 to some random free-to-play MMORPG. Why do you think someone wants to play your WC3-ORPG and not the MMO ? The later will have much better grafics, a bigger world and many more things you dont have, still yours might be more fun.
