Re: With 128GB as standard, few people will need an SD slot
SD cards aren't just cheap(er) capacity, they're also portable capacity between devices and platforms, i.e. I can trivially move loads of stuff between Android devices and my Windows/Linux PC.
If Google allowed app installs to be properly sandboxed and/or storage agnostic, I should be able to pop my SD card out of my old phone into a new one and be up and running immediately with all the apps. They might have do ditch vFAT and/or exFAT, but that's not necessarily a bad thing.