The retirement still leaves us with 10 products:
Prophet-6, PRO 2, Tempest, Prophet 12 Keyboard & Desktop, Prophet '08 Keyboard & Desktop, Mopho x4, and the two Eurorack modules DSM 01 & 02.
There's plenty of room now for lots of mid-priced stuff. Remember: there haven't been any budget or smaller versions of the most recent hybrids (Prophet 12 & Pro 2) and the most recent analog design (Prophet-6). That could now be done without taking away too much from the flagship products.
I would expect, though, that most stripped down versions will find their way into the Eurorack world, namely as single elements of their flagship products. Because the Eurorack market is clearly a bigger thing now than it was back when all the desktop synths were introduced. What would make sense, for example, would be oscillator modules: one that contains the digital waveforms (incl. Superwaves) of the Prophet 12 & Pro 2, and one that contains two of the Prophet-6's VCOs.
As soon as the Mopho is gone, there'd be also room for another analog mono synth - maybe a single voice version of the Prophet-6.
So, in short, I would predict less desktop instruments and more Eurorack modules, especially now that even Roland and Moog joined the party, and a couple of downsized budget versions of the most recent flagships.