I don't know....this seems like a lot of worrying for the sake of worrying. The first issue isn't out, and it's by an acclaimed team who worked well together. The premise is solid and it looks mainstream enough to finally give Hawkeye that push.
And so what if this fails? Could it be any worse than his other solos? He'd still have big roles in Avengers, Avengers Assemble and be leading Secret Avengers. I think this is a great time to give him a book that explores him as a character while the Bendis books have been lacking in character growth for years. Character changes yes, but explained growth? Not at all.
As a Hawkeye fan people should be optimistic for this series. At the very least it won't hurt the character as much as his stupid run as Ronin. So just sit back and relax and look at the pretty art until we get our hands on issue 1. This isn't a drastic re-imagining of the character. This isn't character suicide. And it certainly is not the only place we'll see Hawkeye represented, so if you wind up not liking the series you have at least a 1/3 shot (as of now) of a writer writing him to your liking.
It's a great time to be a Hawkeye fan. Just stop being typical fear-mongering, change-hating Internet quarterbacks for once and enjoy the ride. And this is coming from someone who has over 2 or 3 thousands posts, mostly bitching and complaining. Trust me, this isn't one of those times we should be bitching and complaining.