Displacement far enough that they are outside of the local political jurisdiction is specific to there. In places like Peoria, it's just further economic immiseration within Peoria. Most of America is not being gentrified, rents are just rising. There's a difference.
| (a) there isn't much evidence for
There is plenty of evidence for that. You might just have a recency bias.
| negates your earlier argument about assuming rational actors
I don't put people mobilizing into the ideological framework of "the market". I don't put much faith into the ideological framework of markets generally. I find it only slightly more useful of a tool of understanding social forces than, say, astrology.
Importantly, I'm not talking about what will happen by virtue of some outside force or guarantee of history. I'm talking about we need to make happen by force of will.