Since 2013, it's been classed as "permitted development" (so, automatically allowed as long as the building isn't listed as architecturally or historically important), and liberalised further in the early 2020s.

House prices have outstripped commercial rents for most of this century, and change of use is cheaper than demolish-and-rebuild, so I'd expect to see the trend continue.

The issue with unsuitable floor plates is real, though, particularly in larger buildings. One solution is to cut chunks out of the curtain wall, turning part of each floor into an open-air terrace which functions as a light well. The reduction in useable floor area means that's only really viable at the premium end of the market, though - a prominent (albeit mixed-use) example is https://www.constructionenquirer.com/2024/07/18/striking-new...