non of the listed architectures have official Debian support anymore

i.e. they are only still around because they haven't caused any major issues and someone bothered to fix them up from time to time on their own free time

so yes, you probably won't get them back in once they are out as long as a company doesn't shoulder the (work time) bill for it (and with it I mean long term maintenance more then the cost of getting them in)

but for the same reason they have little to no relevance when it comes to any future changes which might happen to get them kicked out (as long as no company steps up and shoulders the (work time) bill for keeping them maintained