Really they have been designing this game for what 7 years now? Hell the president only stays in office for 4 years then it's up to reelection process.
Basically the same old devs will have the same old ideas over and over again.
It's gonna take some new blood and fresh ideas to break this chain. Maybe blizz should let Ghostcrawler go over to titan and let someone else assume the role of lead systems designer for awhile.