At some point the technology will catch up and then there will be better data on what the limit is before a pitcher is going to need TJ. It seems number of pitches thrown over a short period of time is the best indicator we have now, so the rules requiring rest that have been implemented in most youth baseball should be coming to college baseball before too long.
And just like youth coaches had to adjust, college coaches need to expand the number of pitchers they rely on. Really, there is no excuse why with most college rosters having 15-17 pitchers that coaches don't dig deeper into their roster to spread out the pitches and innings during the regular season. If the NCAA truly cares, they should require that all 35 man rosters be active for home series and then when games turn into blowouts either way, go down further on the depth chart and have other kids take on some pitches and innings. Save your horses for the CWS and maybe they can survive increased use during that period if better rested during the season.