While clearly theres both for and against in the arguments over gentrification. It seems to me its only by at least some gentrification, raising values and desirability, that some of these buildings, areas, and basically charm, gets preserved.

Bangkok's Chinatown at heart of heritage battle- Nikkei Asian Review

I am personally not into Bangkok becoming just another metropolis, or losing its street foods, hawkers, and those things which are part of its DNA. It is possible to develop and grow and still retain these. Unfortunately to do so requires planning controls, preservation of architecturally nice buildings, good transport networks to allow commuting from outside of downtown, etc etc.. Aspects which bangkok overlooks.