I think that is the future. Microsoft may be abandon window platform…
haha i think that microsoft abondoning windows is not really happening thought the idea of a web version of rhino or even a cleaned up version on the web like Sketchup has, would be very cool!
Rhino functionality can be used on Linux through the Rhino Compute technology. You need another host program to do the modelling. For instance I started prototyping some surfacing tools using Rhino Compute in Blender
It should be possible to do the same for instance for FreeCAD