You've mentioned grandfathering with a high degree of certainty. 😂 The one thing you can be certain of in Thailand is uncertainty. 😂 There's no guarantee of grandfathering in any future changes. It can not be relied up. A member has given an example of some more recent changes that did not have any grandfathering. As I have stated, the Thai government may decide on a broad policy with the agenda of raising the financial capacity of retirees here. Many may be tipped out of Thailand. Probably given 12 months to comply, or to sell up and leave. I have also stated there may be changes to the age requirement. Example, retirement visa from 50 to 75 years of age, after that, no more long stay visa. They can do what they want, as foreigners have no rights here.