Might become more viable in places like CA, with high electricity prices and dummies who just now, due to power shutdowns, are learning that solar panels don't mean power backup if they don't have batteries attached.
As I've said in the past, I'd be interested in this kind of setup - whether roof tiles are separate solar panels - if the powerwall would additionally let you charge it via generator. It really seems like the only reason they're not providing that as at least an integrated add-on option, is SJW environmentalism and not wanting to associate their product with evil fossil fuels.
I care much less about the environment than I do about being able to run a heater on a 5 degree day after and extended power outage and prolonged days of cloudy skies.