Even if a mechanic for everyone to get Alt Sweetlings (and all Snow Angel variations, for that matter) is never put in place, at the very least I'd like to see new blood in the existing alt gene pool. Many alt owners are no longer active, so there are fewer and fewer alts producing babies, and folks like Starscream compound this problem by intentionally retiring their alts from breeding. I think there should be a chance that newly caught CBs alt.
My ideal solution would be to not only see the Alts released in-cave again, with the cave considering Alts a separate species so they didn't count against the limits (wouldn't it be great if everyone could have both!) but also give them a chance of breeding true (maybe connecting that mechanic to the time of day that an egg is bred or hatched).
For the sake of disclaimers: I DON'T think I'm entitled to every single sprite out there. I DO, however, think it would make the game still more enjoyable for me if that was a possibility, and I think it would just make for a better game all around with far less drama if everyone knew that by putting in enough time and effort they could have a complete sprite collection. I also want to see artist's wishes respected, and would expect them to be contacted for consent about any new mechanics. At the end of the day, though, I don't think it makes any sense for Alt Sweetlings to remain exclusive to folks who experienced a single glitch 8 years ago.