Oh he'll play. I highly doubt he'll get drafted (Unless a sneaky-good draft team like the Patriots, Rams or Ravens pick him up in 7th rd), but he will most certainly sign a RFA contract and with his motor, he will find a place on some team for a little while. I could see a team using him kind of like the Ravens use Elvis Dummervil...in pass-rush situations or when you just need a guy with high energy to go chase the ball.
I'm not saying that Whitlock will be the next Dummervil, but I would bet money that he will be on a roster come week 1 next season due to his relentlessness.