Wouldn't be too good IMO. Too small for NFL is what I've always thought.
Wes Welker does pretty well for himself.
His stats at Notre Dame were inflated, because of the system they played. It was a spread/pass happy system under Charlie Weis and Jimmy Clausen. I don't think he could be a star, but he could be a real solid role player, in the Welker mold.
But, him "staying" with baseball is obvious. He's making good money playing baseball. NFL teams wouldn't throw ridic money at him, he'd have to go on a small deal and work his way up. Very tough to do, in a sport where you could get injured on any play. Here he has a contract.
Also, the NFL may not even have a season. So, for him to "quit" baseball and get into football mode, could mean he could be going without a paycheck for a full year before he even gets to try out and work out with a team. He may be a bad baseball player, but he's not an idiot.
On top of all that, he's only 26 years old. He IS a bust thus far, but i wouldn't write him off just yet.