Blizzard had a very big and dedicated fan base, the launch of a Blizzard game used to be one of the biggest gaming events of a year, their IPs are (were) loved by huge numbers. Current management did squander most of that good will in the last few years (mainly optimizing their new games for addictiveness instead of designing for fun), but I don't think it is too late, if under new management Blizzard pulls a 180 and goes back to make good games with the old IPs, fans will come back in droves.
Right but if nothing about what made it good from the start is left what advantage would they have compared to any other assembled team? Games get replaced by the next new great thing at a rapid pace, there's no moat. So really don't get the idea of paying premium for a studio that Used to make great games.