The sanme as if you ran out of gasoline or suffered a mechanical breakdown: Call a tow truck. And I bet that Tesla Motors will not give the proposed Model 3 the same road care as for the higher priced Models S and X. We all get waht we paid for.How will they handle this eventuality? It's gonna happen. Tesla will try and get the vehicle to a Supercharger or Service Center (they can charge a Tesla) GM dealers not so much.
What's the plan?
Entitlement.Why should GM have a plan for BEV owners who just don't plan their trip according to the available on-board energy and re-charging opportunities? They designed and built a BEV that has a huge range and include with it a great real-time-range-forecaster and all sorts of tech support for finding available charger locations both before and during your trip. If range anxiety and your inability to use all the tools GM provides to you to manage your power is a problem that you as an owner will actually expect GM to address, GM probably will advise you to buy a Volt instead.
Wonder if there is any technology out there to "jump charge" EV-to-EV? So a friendly driver could help out a depleted stranger.