We are well on our way. The EU is holding the manufacturer liable if a cellphone radio is "modded", thus manufacturers are blocking the ability to unlock bootloaders.

If eventually, that is every phone, then grab a hotspot and get tethering.

I did have a chuckle at the thought of having a cellphone for your (modded) cellphone... but then I thought about it: "meh, yeah... it's not a bad idea. I'd do it."

Well then goal achieved, custom roms will be even harder to use, and from when I've seen I've got every reason to belive that every phone will get to that point.