New groupset: Shimano Cues. Replaces Tiagra, Sora, Claris, Deore, Alivio, Acera and Altus.

Yeah, they would definitely not, so you might be able to keep the old bike working for many years to come.

But when buying/building new... I think CUES is a good thing, there is joy to be had out of reasonably prized equipment, you can mix and match the gear range, chainset setup and handlebar style(when road levers become available) and end up with a cohesive groupset with good chain management

LinkGlide 300 9-Speed
11-46t (11-13-15-17-20-23-28-36-46)
11-41t (11-13-15-17-20-23-28-34-41)
11-36t (11-13-15-17-20-23-26-30-36)
LinkGlide 300 10-Speed
11-48t (11-13-15-17-20-23-28-34-41-48)
11-39t (11-13-15-17-20-23-26-30-34-39)
LinkGlide 400 9-Speed
11-46t (11-13-15-17-20-23-28-36-46)
11-41t (11-13-15-17-20-23-28-34-41)
11-36t (11-13-15-17-20-23-26-30-36)
LinkGlide 400 10-Speed
11-48t (11-13-15-17-20-23-28-34-41-48)
11-43t (11-13-15-17-20-23-26-30-36-43)
11-39t (11-13-15-17-20-23-26-30-34-39)
LinkGlide 400 11-Speed
11-50t (11-13-15-17-20-23-26-30-36-43-50)
11-45t (11-13-15-17-20-23-26-30-34-39-45)
LinkGlide 700 11-Speed
11-50t (11-13-15-17-20-23-26-30-36-43-50)
11-45t (11-13-15-17-20-23-26-30-34-39-45)

2x chainsets
36/22, 40/26, 46/30, 46/32
1x chainsets
30/32, 40/42

Particularly for 2x setup, you may want to pick a 9 speed, "narrow range" cassette, as the gear progression is the same al over, in order to keep crosschaining (and even weight?) Under control. Not a single 1 tooth jump to be seen, so racers of course may dislike this.

There are already in the market 2 "higher end" mtb groupsets CUES/LINKGLYDE conpatible (10s Deore M5130 and 11s Xt M8130) so there is already people suspecting that everything higher end will become Di2 only going forwards