My guess is if this tourist visa comes to be, it will not be equivalent to a 10 year retirement visa. I think it will allow tourists, as you say, to come and go as they please for up to 180 days or less in Thailand per year, for the next 10 years without any further visa requirements.
If that does happen, why do I think the following word will end up being the result: Backfire
As for the retirement visa, I foresee no changes whatsoever from the current rules. I think most likely this 10 year tourist visa will have no benefit for retired expats. On immigration's list of which groups are going to get a break, expat retirement visa holders seem to always be way down at the bottom of the list . . .
I think immigration's idea of giving retirement visa holders a break is the fact that they have not raised the 1900 baht visa fee.