It looks "cool", in a early 2000's kind of way, but after watching the video it didn't seem to solve any new problems other than maybe enhancing collaboration a little bit. I feel that new platforms/OSes need to have a killer, differentiating feature that makes it stand out and solve a real problem an order of magnitude better than its predecessors. Also it always seems that feature has to be "normal" user facing, not programmer facing. Real users don't care (or even know) if your whole platform is based off of shitty text files, or addressable object oriented unicorns.
To put it into modern terms, think of a Croquet world as a peer-to-peer 3-D Slack channel that anybody could host as easily as a web page. It used TeaTime and two-phase commit for low-latency synchronization, making it a distributed, real-time database of sorts. And what it distributed were objects and events, so maybe also think of it like Ethereum contracts, where the members' VMs together constitute the execution engine.
Croquet was and still is far ahead of its time. Only in 50 or 100 years will people realize the potential, at which point Croquet itself will likely have been forgotten completely :(
