Guys...
Battle.net used by classic clients (War3 RoC & TFT) will be shut down (or already is ?)
Everyone, those owning Reforged and those who don't, will need the Battle.net application launcher to play online Warcraft 3. If you don't own Reforged, you just won't be able to play with the Reforged graphics (but still have the new menus UI).
Blizzard has no interest to link the new Battle.net with classic clients. Waste of time. Maybe they will do it, for the sake of angry nostalgic players, but we should not hold our breath.