It is not over yet for cool ICE

[Ishrub]

Super-compact internally rotating combustion engine packs a solid punch

An innovative new combustion engine eliminates half the guts of a traditional engine, and uses a fascinating internally rotating piston and sleeve arrangement, making it lighter, simpler and more efficient while still making strong power and torque.

newatlas.com

 

[Jagster]

As a single cylinder engine, it is quite an elegant solution, but I doubt that this design will be competitive to the traditional ICE with a conventional crankshaft etc..
It's just a neat solution for a small lightweight low power engine......Drone or battery range extender on a small BEV.