[sremani]

There are no real geographic barriers stopping Austin's growth. I am not in Austin but if I have to guess, the public transport sucks balls. You have to have Car unless you live in the urban core. The bigger problem in Austin is, their nimbyism manifested in such a way that City and County constrain the growth by not expanding the infrastructure. But the land is there - the city can grow into a bigger metro.

[RhysU]

Well, there's a river with too few bridges.