zBrush was always the leading app in it's segment, acquiring that app was like getting a crown juwel into the portfolio. Autograph on the other side really is tainted with a first reception of being too expensive, too incomplete and too 'old' (referring to their UI/UX and marketing). In my view, the brand 'Autograph' has little clout, I'm sure they'll drop the name at least.
The current app and tech? Well, that's a more complex question. You're right, to suddenly have an almost full-blown competitor to AfterEffects is attempting to wield against Adobe. Would Maxo dare, though? Right now they have strategic and sales-alliances like the MaxonOne+Substance bundles. I guess they actually make some bucks from those cooperations. So, what could Maxon gain if they sever the strategic alliance with Adobe and place an competitor? Not much, I guess, because comping land already is a crowded place. There's the AE-people with decades of AE-projects, -scripts, -plugins, - tutorials. That audience is deeply entrenched. The subset of people who are so pissed by AEs legacy cruft already have alternatives in Blackmagic's Fusion (priced very competitively), Blender's integrated comping (priced even more competitively), with even further options on each end... OpenSource Natron or Hi-End Nuke. What would be a 'Maxon Autograph's USP here? It would need to be better than 20 years of AE-development and better priced than free. Tough battle.
On the other hand, it would make sense to port the RedGiant offerings not only to Resolve, but also to the rest of comping apps. Maybe the Leftangle-Team will just port stuff and deal with the comping workflows / tech environment of the other apps.
Who knows.
In the end, I actually hope you are right and we see a fresh new competitor for the Adobe behemoth, I just fail to see the dollars on that way 🙂