On the contrary at least one of them is in the hall of fame and the entire league went through a copycat stage where every team was like "We need our own Bob something-or-other" (that was the guy's name I forget his real name he died not too long ago so they did a special on him) because the speed killed defenses. We're talking about a while ago, but our own Mark Duper I believe was a track convert. Nowadays I think that whole thing is outdated because our football player WRs, now ARE like as fast as track stars. I mean seriously these guys run almost as fast as some of the fastest people on the planet.
But that doesn't mean a similar thing couldn't happen at a different position. Brock Lesnar doesn't just have pro wrestling under his belt, he did play football in high school (at least I hear he did) and in college he was the NCAA wrestling champion. The latter put together with his size and speed characteristics especially, make him a pretty intriguing prospect especially at a position where you don't have to be a rocket scientist to play good football (see Simeon Rice). For passrushing, at DE its pretty much all about one-on-one and his freakish abilities could shine (along with his experience with ncaa wrestling). For defending the run though thats where he's got to learn some technique I would think.
The main reason I think there's an opportunity for him at DE is because there are DEs out there that have his kind of freakish abilities (the freak, for one...and jason taylor) but there are not that many. The WR market is flooded with guys who can run a 4.4 or even better though...so thats why the whole track star WR thing has fizzled IMO.
I'll just add real quick that Tony Dungy tried to recruit this guy into football after he got done with college, before he became a pro wrestler. Its a case by case basis here I'm not saying pro wrestlers make good football players, what I'm saying is in this particular case this was a guy some football coaches liked coming out of college just because of his raw ability and his being an NCAA wrestling champ. The pro wrestling thing happened after all that and its the pro wrestling I think that is making us all jaded about the whole possibility.