RD and PoR HD collection is the dream.
Those two games can definitely use a bit of updating and QoL features, but I don’t think they quite need full-fledged remakes like older FE’s, so I have hope IS will get around to them sooner than later (and I mean, fuck, if they’re really going to keep going in order for remakes, we won’t be seeing a PoR remake until freaking 2052 or something).
So I hope that becomes a side project for the FE devs at some point in the next few years. Like you said, they are nearly impossible to find legitimately these days, and plus Ike has retroactively become the franchise’s most popular character due to Smash, so it just makes sense to revisit his games with a nice modern touch.