The removal of the RMAH in Diablo shows that they have learned a painful lesson and are trying to fix their biggest mistake. All of the problems in Diablo came from the RMAH. The Online only requirements were there to prevent cheating and that caused lag and login errors. The drop rates were monitored and throttled to sustain RMAH prices. The game was short and focuses on grinding items instead of having hard and interesting bosses and mechanics. The list goes on.
What the "Loot 2.0" system shows is that Blizzard realized that the 5% cut from RMAH isn't worth it in the long run. Releasing a subpar and unplayable piece of garbage is the quickest way to kill a franchise. They figured out that very few people are even considering buying the expansion pack (i know that i won't), if it doesn't have offline mode and better loot system.
This 180 degree turn in Diablo gives some me some hope about the future of Blizzard products. If they stop trying to milk their players and instead focus on expanding their player bases the company will have future. But the future doesn't look good for Blizzard. Starcraft 2 popularity is going down even in Korea where League of Legends is becoming the new top E-sport to watch. Diablo left such a bitter taste that few people will buy the next expansion. Warcraft is getting far too old and it's loosing hundreds of thousands subscribers every quarter. Blizzard's sources of revenue are dwindling and they will have to decide between investing in new and better games that will make people gladly return or continue down the path of milking their shrinking player base until there is no one left and they shut down like many other studios before them.