I'm looking into buying a house but anything that is affordable is out in the suburbs or neighboring cities. And I say that as someone who makes $100k.
Austin does unfortunately have a terrible record when it comes to public transit. The rail system is a joke. Although, I am hoping that future infrastructure projects will focus more on creating a viable train/rail/subway system from suburbs to dt/domain. The density of dt is skyrocketing with recent developments, and I can only hope that it will spur a rethinking of transportation policy.
As for the cost of housing... unfortunately, all the outsiders coming in are flooding the market and driving prices ridiculously high. I don't really see an end to the boom... which is why I too have stayed away from considering purchasing a house for the time being.
Also, the Domain development has somewhat eased the traffic situation by shifting a lot of new businesses slightly closer to the Northern Suburbs. Which is a welcome respite: the traffic situation would have been a LOT worse (if that's possible ;-) ) had the Domain not been developed.
I'm pretty optimistic about Austin's future. It offers an extremely high standard of living on a developers salary. Most suburbs are not too far away. There is a lot of undeveloped land. And the City Government is proactive and responsive to the needs of citizens. I think it can evolve into another Tech hub, maybe rivaling Seattle. For it to rival Bay Area, I think we would need a lot more VC's to set up shop here.
Disclaimer: lived in Austin for 5 years now, loved every year so far.