1. Maybe, but you can't prove that to stockholders as well as a subscription-based game. They "may" spend money is not they "will" spend money
2. and 3. Your opinion isn't a concise demographic.
4. One reason Wildstar stands to hurt WoW is it LOOKS and FEELS like WoW. All the other companies tried to be like that but with their own spin on it. Most if not all have failed.
5. I'm skeptical given the releases and development of Star Citizen it will be at full release before 2015. If not, it'll be Q4 of 2014 (most likely after the others have already released and had a few months in the market).
6. Diablo 3 was pretty shit for what it was and what it wasn't. It was buggy on release, they never fully fixed anything, pretty sure the promised PvP on release (if it's even out now) is probably still in the works. And the SP was ridiculously short, with a clear "WoW-like" intent to have you grind for better items and "more challenge". Despite it was the same four acts with simply changed loot and monsters stats.
Even though WoW is down to 7 million subs, that STILL makes it the most popular MMORPG to date. I'm not defending it or Blizzard, I'm pretty focal Activision done fucked it all up.
But what I DO know is, as a company, they need solid and reliable revenue. Their release schedule can't compete with other Triple-A companies, as is their IPs. They have floated on WoW and their name for years, and they KNOW WoW is still their principal cash-cow.
And to be fair, most of us know the majority of the WoW devs were originally moved to that Titan project. But we all know it was scrapped what? 4 - 5 years? And they planned to start over with a "2014 release? They scrapped years of work, and then they intend to get it to full release inside of 18 months? Chances are whatever that is, it may flop as badly as Diablo 3 is.