This is something that actually differs from MVP to MVP. We all handle situations very differently; some MVPs prefer the politically-correct approach to touchy topics, others prefer to be more direct with regards to their opinions.
Honestly for me, I often find myself hopping around with regards to posting style depending on my knowledge of the subject, and how touchy it is.
Well, every MVP has their own opinions. We sometimes disagree with one another, even in forum discussions. The only reason players are ever chosen to be invited into the MVP program is if they demonstrate helpfulness and the ability to participate in discussions constructively, not because they have similar opinions.
Sometimes these disagreements can be quite fundamental. To avoid creating a heated argument, that tends to be kept off the forums for the sake of 'professionalism'. There are some MVPs who have totally different opinions in comparison to others, and that's really fine. Constructive posting is the only requirement.
Personally, I believe that World of Warcraft is indeed in decline. However, here are some reasons why:
World of Warcraft simply cannot compete in the Asian market. Although there have been some signs of decline in Europe and NA, the actual decline has not been as dramatic as what we see in Asia. The reason for this is simple: the Asian market is after different things in an MMO. The Asian MMOs are blowing WoW out the water as a result.
Age. For the same reasons you have mentioned - WoW is getting pretty old now. Some people have gotten bored, and it is getting harder to woo new players into a game that has existed for 8+ years now.
The lack of an unreachable goal. In order to keep players motivated to play the game, especially casuals (I kind of hate that word in all honesty), the game needs some form of an unreachable goal that deceives players into believing they can get it. This is something Vanilla and TBC did well in.
I am not personally sure my opinions on Blizzard's business practices are quite solid. But for what its worth, what I think is that whilst it is true that Blizzard is a company that needs to generate good profits to appeal to shareholders and survive, they are a company that still keeps in touch with the very bare essences of gamer culture. There are some gaming companies that have completely lost touch with actual gamers, and have terrible reputations as a result.
Whilst company profits do weigh in on their design decisions, it is no surprise that in the case of Blizzard, it is also largely player-driven.
I have mixed opinions about him. There were times when I screamed 'OMG THANKS GC", and times when I just wanted to scream out every bit of profanity towards his decisions. A good example of the latter was when they decided to equalize loot and lockouts between 10s and 25s, which effectively plunged most 25-man guilds into a constant state of trying to survive. How mine has managed to pull through Cataclysm and MoP so far is a mircale. I believe that is not entirely his doing though -- it is a team of people who make these decisions for the game.
Which leads me to the next point. Often when players lash out at Ghostcrawler for controversial decisions related to the game, they forget that Ghostcrawler is not the only one who is involved in the decisions. He just happens to be a face people can scream at.