The problem with Pittsburgh (and the rust belt in general) is that it's still losing population in general. Adding a few tech jobs won't change the fact that it

The problem with Pittsburgh (and the rust belt in general) is that it's still losing population in general. Adding a few tech jobs won't change the fact that it's a generally undesirable place to live (old infra, cold winters, high crime) - so people with the means of relocating will generally do so. Meanwhile, there are plenty of cities in the south that are rapidly gaining population, especially from people with education, and would be excellent places for companies looking to expand. Atlanta, Nashville, Austin, Dallas, Raleigh, Durham, and Charlotte are all far cheaper than SV, and are much easier to recruit talent to than Pittsburgh or Columbus.