Motorcycles have... and have had shaft, chain, and belt drives. Having both hub gears and chain and cogs isn't anything new to bicycles. Bringing back a bicycle with a driveshaft and adding bicycles with belts just gives cyclist more options.

I don't expect to see a one type fits all bicycle in my lifetime. Even with all the progress and changes in the last few years.... I can still buy a steel single speed bicycle nearly identical to what I owned over half a century ago.