I got a letter into Patriots News Weekly a few weeks back saying exactly the same thing, that Davis becomes expendable after the first pick this April... "Angry" Andy Hart fired back "What's so great about Domanick Davis," rattled off wrong off-the-cuff stats, and basically said he's always injured anyway. Eh well.
Davis is a good back, catches out of the backfield well, and basically is a dual threat kind of guy. Plus, he can get you touchdowns, a la you-know-who. (PS Corey, you jumped the shark. Nobody believes in you. We thumb our noses. Yadda yadda yadda you know the drill.)
But the Davis question (from Houston's point of view) will be determined by cap logic, in my opinion. It comes down to what Davis makes, because Bush gets number 1 number 1 money - so unless Davis is playing on the cheap, seems unlikely you keep him on the top of the depth chart. He's looking for a comeback year - he's not Priest Holmes or Marshall Faulk, with his best years in the rearview mirror. I think he wants to be number 1 somewhere, rightly believes he deserves decent money, and therefore is a liability to the Texans at a time when they have multiple holes to fill, and, like everybody, a salary cap to consider (especially if they don't want David Carr to disappear into a linebacker-covered hole in the turf of Reliant Stadium.)
Just my .02,
PFnV