But this is just unfair.
Bretonnia and Tomb Kings are slightly different kind of beast here, because GW were clear from the start that they will squat those armies.
However this isn't the case with High Elves and Greenskinz, because they were part of box sets, for Sigmar sake! When you bought Spire of Dawn or Start Collecting Greenskinz you have every reason to believe that you could legally play High Elves or generic Orruks in the years to come!
It was pretty safe to assume that those armies won't be supported as much as "proper" AoS orcs and elves, but. Still. Will. Be. Playable.
I mean, c'mon soup Greenskinz, Gitmob and FW Destruction into one poor-man Legends-like Battletome, call High Elves "Astraneth" (stars theme is fitting for Azyr) or something like that, make Tomb Kings Order undead faction, merge Brettonia with leftovers from Empire Knights and make clear that they will not get any models in the future.
But give them proper rules, allegiance abilities, crusade bonuses, spell list, artefacts and mount traits and update them once for edition. Why? Because your damned customers have paid you big money to use those minis.
How can I buy now old stormcast box not knowing if they won't be replaced by Thunderstrike altogether? Or Greywater Fastness or Anvilgard box? They phased out one box, they can easily squat the other ones as well.