As far as it catching up to him, I think unfortunetly it has already. I think he could have been one of the greatest MX racers ever if not for all of his injuries. ....
I don't necessarily think that is a "catching up to him" thing...it seems to me that his focus was on the freestyle stuff and the racing was "secondary". I can't recall reading any interviews, but I kinda' doubt he has regrets about how his exploits have harmed his racing career. I think it was a conscious choice for him.
After all, he'd be a lot less famous if he was "just" a top MXer. If you walked up to the average kid on the street, I'll bet the odds that they know who Travis is are significantly higher than the odds they know who Stewart, Carmichael, McGrath, Hannah, Johnson, Decoster, etc. are.
We're gonna' hear someday that he took himself out, or broke his back, or something like that...it is inevitable.