I can see how Torchwood could possibly get American treatment, especially with Julie Gardner, Russell T Davies and Jane Tranter all based in California now.
And honestly, I'd so much rather have an American Torchwood than an American Doctor Who remake. Which is something that really does scare me, after all. Especially if it is one not also trying to serve the UK market, which the 1996 TV movie did.
I really don't have a massive opinion about it. After all, it's a genre show on FOX -- it will get canceled after at most a dozen episodes anyways.