Here are a list of Ideas that can help make Diablo2 even beter
Yes the Auction house in D3 failed but this will be the PRIME IMPORTANCE for Diablo2 because we dont want JSP making bot money and selling items for real money and programs as well Preftecting this AH will ensure that we dont have problems with bots.
2 8Player Set.
being able to make a game with 8player set will allow us to MF better and give us a better chance to farm at higher risk
in a mod of diablo2(path of Diablo) Corruption was a stroke of genius
i like diablo3s mule stash idea use that if possible
5 maybe add some more bosses/maps like act6 a bridge between diablo2-3
but yea comment some ideas bellow and let me know what you think of mine.