If people need multiple PBS channels that badly, there are creative ways of going about that. I have my local PBS OTA, another through Dish, and a bunch more on KU band satellite. More PBS than anybody could ever want
Having 2 PBS stations for one DMA is probably overkill and I'm not surprised the University decided to take the money and run.
Just my taste, but WTCI Chattanooga TN doesn't carry Worldview/local shows (music festivals, etc) that I do receive on WNGH (GA PBS) which is nice. Luckily, I receive both PBS affiliates. WNGH is more geared for GA residents however, thus the designation GPB. The same shows weekdays are the same for the kids on the main channels, and of course PBS Kids channel, and Create 9 times out of 10 show the same. I will say WNGH main feed is broadcast in 1080, WTCI is 720, all others on both are 480. But not really that big a deal, just my tv shows the diff in resolution when I turn those channels on.
We have two PBS affiliates here in the El Paso DMA (just 40 miles apart), local KCOS and KRWG from New Mexico State University in Las Cruces. KRWG has state funding and university support while KCOS is strictly a "community" station. There is some overlap in OTA coverage and both are available on cable and satellite. Even one PBS station would struggle here as a great percentage of the population does not watch TV in English. KCOS has aways had technical problems and budget shortfalls.
I wrote KCOS several years ago suggesting that they form a partnership with KRWG to cut expenses or even merge and become a full power translator station. I received a prompt and polite response that this had been attempted but the NM station was not interested. I still suspect that in our situation it would be the local "community" station to sign off for good and the university PBS would survive.