the key word in the original post... 'theoretically'.
Until it happens don't worry about it.. I've watched several lawyers youtube videos and the seem to think that it's probably not happening as it will be very hard to enforce. Also other news sources think that the rich and powerful Thai people (who this is actually aimed at) won't allow it to happen and use their obvious influence on the government... my personal prediction it will be delayed and then fade away.
Yes basically we can give you all the info now and it's totally different, keep any eye on visa info groups and you'll get most of the info in rhe meantime... Having holidays here to research where to live etc is a good idea too...
Things can and will change in that amount of time. What anybody says now maybe very different next week, next month.. nevermind a couple of years. Come back and ask maybe 6 months before....