If a card can easily be reprinted, a knee-jerk pre-emptive ban is not necessary.
Teferi's Protection is not on the reserve list and references an existing Magic character so reprints down the line are not going to be much of a logistical problem. Nexus of Fate was a problem in certain formats, but overall doesn't do anything we haven't already seen. I have Nexus of Fate in my
Edric, Spymaster of Trest deck and I would rather have a
Time Warp or a
Capture of Jingzhou than Nexus of Fate because I can cast them sooner. Nexus of Fate has a Khans theme to it so if it becomes
that sought-after, if we ever revisit Tarkir, it
could get reprinted. People pretty much forgot about that card after it got banned in Pionner and Historic anyway.
The
Walking Dead cards are going to be more difficult to reprint because they are based on a popular non-Magic franchise and feature mechanically-unique abilities that may be difficult to include in a future expansion. They would have to reprint it in a Masters set or something similar that focuses exclusively on reprints, but then again, they'd have to change the card names and whatnot so even that seems a bit more complicated than it's worth.
They should have just gone the skin route as they did with Ikoria's Godzilla cards. I hated that they crossed over like that, but you still had an actual Magic card with the same text so who cares. Just wait for the right set to come out and then offer skins of appropriate cards. Aren't they returning to Innistrad for some vampire/werewolf supplemental product in the next year anyway?
Anyway, it has been clear for a while that this game is not really for everyone; WotC's social agenda doesn't preclude discrimination based on individual player income. Harold McNeill is a bad man, but it's fine telling poor Commander players to suck it.