You could just support new housing development and sane urban planning. Then maybe Austin will still be a pleasant and semi-affordable place to live in 10 or 20 years. Lots of moderately wealthy people moving in could be, in some ways, a boon for Austin, if you don't do everything exactly wrong.

(The alternative is to refuse to build new housing or do any reasonable urban planning out of resentment towards newcomers, and then watch in frustration as traffic becomes even worse, housing prices continue to skyrocket, and you have rapidly rising homelessness and crime. The same way most cities in California handled this situation.)