The fact that Apple threw up a "temporary 'sale'" on USB-C-related cables and adapters shows that they're not going to revert their ways by putting back an older USB 3 port or the MagSafe adapter. They will make people adopt, but like the 30-pin-to-Lightning cable transition, it was troublesome until it finally died down.
Just like older Mac minis and MacBooks that have removable memory or removable hard drives, they will still have a place and value for diehard users, but it will eventually diminish when their CPU becomes too slow or when the new hardware becomes more of a requirement than an option, which is around the same time when many new macOS features like Handoff, Continuity, AirDrop, etc. become more prevalent.
I'm waiting for adapters to look more streamlined, and possibly with an additional tether, so it won't get lost.
Right now, the present is bleh with Kanex adapters like these. Small, but still bulky and ugly.