Not quite, because there's a functional difference between removing a spec (whether or not it is replaced by a different one with the same name) and adding one.
Still, based on all evidence we've seen so far, that would mostly be what happens. Any tank that doesn't quit over losing their favourite spec will just switch to a different class, just as with added tank specs. The availability of tanks remains largely unchanged.
Not sure why you think this time would be any different than the last three times.