They can make it whatever they want. They could make it just enough to knock out the top paying, but still meager, western old aged pension country, thus all the pensions / pensioners below it, from other countries all around the world. Or, they could raise it really high, thus raising the financial capacity / standard of foreigners living here, and also returning Thai properties to Thai's, which I am sure would be an election winner. My point is, just as a member commented on how Cambodia can change their visa laws at any time, so can Thailand. As I have said before, a retirement visa is nothing more than a 1 year tourist visa. it was debated in a thread a long time ago and the conclusion was the only thing an individual on a retirement visa can do that someone on a 30 visa exemption can't do was have a 5 year driving / riding license as opposed to a 2 year license. It's not scaremongering. The 800k baht requirement simply can not stay at 800k baht forever. At some stage, the Thai government will raise it. They could raise it a little, to keep up with the cost of living, thus changing very little, or raise it a lot, as part of a broader plan, which may see many forced out of Thailand.
