The best thing Blizzard can do for this franchise, to save it, is to cancel Diablo IV and remaster Diablo 2 Lord of Destruction. Get the game running smooth from the app, have an effective system in place to deal with bots, eliminate jsp from the game and create an effective trading forum/system.
Once you’ve done this, hire on the D2 remaster team and have the entire D4 team play Diablo 2 LoD Remastered on bnet full time for a full ladder season. Do something to your account names to let us know you’re in our games playing with us so we can interact with you and teach you how we play the game. Especially play with self found / in game traders. When the season finishes, then begin discussing how you’re going to return the franchise to it’s Diablo 2 roots.
D2 players don’t want D4 to be a rebuilt D3 with D2 character names, which is exactly what you’re doing. You claim to be returning to D2 roots, but none of the devs are masters of D2, likely not even good at the game and you’re only asking for input from D3 streamers and gamers, which whom most know next to nothing about high level D2 game play. D2 is 12.25 years older than D3 and there are more players playing D2 in it’s various states (single player, bnet, lan, mods) than D3.
Make a sticky in the Diablo II forum asking for the current D2 player base to share their ideas and opinions. Do the same thing in the Diablo I forum. These forums may seem dead, but if you show you actually care, they will light up like a Christmas tree with 1000s of different posters.
Diabloiinet, a single player D2 forum and d2jsp, a bnet D2 forum are very active forums and they are not talking about D4, because almost the entire current D2 player base is not happy at all with the direction you’re going, which is the 6 skill, cool down, crappy gear, next to no trading D3 model.
Edit: Also pay attention to the very strict single player trading rules on diabloiinet