Erik: so your prediction is that we might see Leica performance but for Leica prices,,, or OTUS as we speak huge & heavy gear???
More or less, both is the case yes.
As the performance of the optics are higher and higher the more expensive they will be, but it is linked to the size, that makes it more expensive to manufacture so higher price as well.
Precision optics need precision mechanics to perform!
Otus Leica M performance is a good comparison
55mm f/1.4 Otus is about the same performance as 50mm APO f/2 ASPH Leica M
https://www.lensrentals.com/blog/2014/06/comparing-rangefinder-and-slr-50mm-lenses-version-0-7/The Otus is half the price but is about four times the volume, double the diameter, three times the length and weight,,,
Same performance,,, yes it's f/2 vs. f/1.4 not really the point here,,,
Key is; Performance is more or less identical.
Sure AFS ring motor will need space but not much.
VR will be in body so not relevant unless you use DSLR lenses for comparison.
Weight can be saved using the good plastics.
There is no free lunch. Sorry