1) I would be happy if 5e was a huge success (like early 80's D&D success), because more players is good for the hobby. Otherwise I am fairly indifferent.Will you be happy if the game is popular, even if it's not one you'd want to play?
Will you be willing to give it a try to support the D&D brand that has brought so many people years of fun, even if the rules aren't perfect? (And really, have you ever thought any version of D&D had perfect rules?)
Do you trust that the game designers are people who love gaming, who want to help others have fun, and who are trying to make a game that best encapsulates what they think the audience wants D&D to be?
Do you think that the benefits of having Hasbro's infrastructure to help market, distribute, and sell the game outweigh whatever limitations might be passed down from a corporate level?
Will you not begrudge your fellow gamers if they have different tastes than you?
2) I'd be willing to try it, sure, but not to "support the D&D brand." D&D had its time in the sun. It was all things to all people for a long time because there weren't a lot of easily-available alternatives. That's changed, dramatically so with the internet and the rise of the D&D retro-clones. The D&D brand is meaningless to me. A good fantasy RPG that's suited to my tastes and those of my group is what's important.
3) Yes, yes, and which audience?
4) Well, that's hard to tell. From everything I've read, I'd say no. It's not like WotC had an issue getting their products into stores prior to the sale to Hasbro. And all of Hasbro's infrastructure didn't help 4e reach Hasbro's target numbers (which I am guessing would have been very solid for a smaller company).
5) I don't begrudge them for their tastes. I do begrudge them for the endless D&D edition wars, which, along with the 5e playtest docs, have pretty much driven me away from D&D and into the arms of other RPGs.