There's a lack of content as soon as people start playing any patch. Pve is unrewarding and pvp is either a gankfest or a stats battle.
Pretty sure most will run dual clients with botting on main, current server, and "pvp" with twinks as I'm pretty sure everyone will get 80/80 GPs for the initial advantage.
This will drive less tryhard new players to quit and it will gradually turn into the p2w casino of 7.x patches.
All the whales from current servers will continue on that "classic" as I'm sure GF, staying true to their profile, will try to milk it as much as possible.
100% manastone socketing, enchant stones, etc. I'm fairly certain it will not be 2.0 or 1.9 as that's difficult to monetize without significant changes to the shop.
Nostalgia is already being catered by private servers [...]. They will continue doing so using all possible exploits and means at their disposal. Incoming botfest.
Edit Olly : Out of ToS.