Simply put, no.
TNA has been around for nearly five years now, and the only guy we've seen make the full time WWE roster from TNA is R-Truth, and he's become a jobber with a shitty entrance and reduced to performing cartwheels in the ring
. Sure, Chris Harris had a cup of coffee on ECW, but someone obviously pissed in it because he lasted a whole three or four months in the "E". Now there's news they signed Lance Cade, but it's highly probable we'll never see him.
Before anyone brings up Christian or Gail Kim, they were WWE vets long before jumping ship to TNA. It's obvious they left the "E" on good terms because Vince brought them back. But Gail Kim is rarely used on tv and tons of people believe Christian was banished to ECW (even though I believe it's great for him and the WWE).
If TNA folded right now, I don't know that any of the originals would be welcomed in WWE. Several should be (AJ Styles being the most prevalent), but it's truly hard to tell if Vince even believes in their abilities because he surely doesn't seem worried about them creating competition for the wrestling world. In the past couple of months, several pretty talented guys have been let go by TNA (Petey Williams & Sonjay Dutt come to mind), but they haven't exactly garnered a spot on the "E". Several guys would be welcomed back due to their reputation with the WWE (Nash, Booker, Foley & Angle), but whether or not they ever became main event players again is anyone's guess.
TNA is simply an organization that gets lumped into the wrestling world and forces Vince to talk about them every now and again. But he's not losing sleep and more importantly, he's not losing money because of them. Until that happens, he could care less.