Will Blizzard ever do it? God no. Is it the impossible artistic/programmatic feat you described it as? Naw.
They’ve overhauled quite a bit programmatically in the past. The major issues with dyes and housing is neither are profitable options. Blizzard can milk recolors all day and folks who have no issue with it are the ones perpetuating it to be so.
Or, y’know, they could complain and demand a one-item, multi-color system. Which is funny because we already half have it in the re-colors we’re getting. Go figure, some pieces of gear have a “ghetto” dye system already in place. All we need now is a system to make it all one piece of gear.
But naw, not profitable, trading post prolong-able, or complained about. Never gonna happen.