I think for 95%+ of applications.. you just need a link to a data center anywhere.

My assumption is the hardware will have one/several smaller models running on it for locomotion, balance, etc.

Then the hardware "phones home" for decision making and planning.

Essentially the planning doesn't need to be close to the device as long as the local models can handle some part of the plan execution and make sure the robot doesn't fall over. The latency shouldn't be an issue. In fact more powerful centralized compute quickly creates an advantage over slower local compute in terms of end to end planning.

I can see some liability issues with that approach.