I have a question:
In other anglo countries such as the Canada, the US and Great Britain, inner city areas that "gentrify" still tend to vote solidly for non-conservative parties - such as electing Democrats to the House of Representatives in the US, electing Labour or occasionally LibDem MPs in the UK anbd electing Liberals and New Democrats in Canada.
It depends on the type of people who are moving in during gentrification. You have the sort of people who work in the FIRE section of the economy, and then you have the artsy, academic and public sector types (bohos and hipsters as convenient stereotypes). The two groups will vote very differently.
If you look at inner London, you have seats like Battersea, Putney, and the Fulham part of Chelsea and Fulham which were traditionally solid Labour but have become Conservative over time as the City set take over. You also have seats like Richmond, where one set of gentrifiers have started to displace the other, resulting in a formerly Lib Dem seat becoming safely Tory last time against the expected trend. On the other hand, you have traditional upper middle-class bluestocking seats (Cambridge, Bristol West, Sheffield Hallam, Manchester Withington) which were safely Conservative pre-Thatcher but are now unwinnable for the party.
