This is a big ship to turn, but he's made progress

I would say these the biggest things done during his tenure (whether directly from his input or not, it's hard to tell):

With the youth:
- The expansion of the US Developmental Academies that offer high quality training at reduced or eliminated prices
- The recent addition of the U12 level at multiple of said DAs, soon to be in all of them
- The initialization of the Doublepass audit of the youth soccer system in the USA and in the MLS

With the senior team:
- Increased recruitment of dual nationals who are key to success at the international level
- Emphasized competing in Europe as a path to spots on the National Team
- Put real pressure on the MLS to increase their standard of play

What is still to be done:
- Youth academies must be able to recoup fees via training compensation and solidarity fees
- A better network of scouting and developing talent in such a decentralized country must continue to be developed and perfected
- College soccer needs to get on board with player development. The biggest help would be adopting a year-long college soccer season.

Some of these things will take 5-10 years before we see the results in the National Team. That said, they're already happening; firing Klinsmann doesn't undo what he's done thus far. If there's a better option available, now is a perfect time to cut ties with him.