As mention above they are going to 3 more efficient squadrons vice 2 overloaded ones.
I'm not sure how two squadrons are overloaded while three will be efficient. There will be the same total number of IPs, civilians, a/c, and flight hours to work with. 20 years ago the HTs were training about 2x the current student load and didn't seem to have trouble with it.
Yes, there were more IPs and a/c back then. But adding a 3rd squadron doesn't increase the number of IPs or a/c. It does, however, increase overhead (more IPs will be out of the cockpit for squadron level meetings/paperwork).
Besides a claim of efficiency, the EMBA study cited above claimed safety would be improved since the CO/XO would have a smaller staff to observe and manage. A couple helo mishaps last year kick started this initiative (it had been talked about for many many years) based on the safety claim. I don't buy it. Again, citing historical performance, in the 80s when the HTs were producing 2x the current student output, safety was no more an issue than today.