Just like we could never have had IPv6 without IPv5.
It's just a frickin' name. We can have 27G right now if we want - just rebrand 4G.
Personally, my response to the whole kerfluffle will be to ignore 5G. I have no reason to use it anyway. Frankly, for 95% of the things I do with my phone, 3G works just fine; and the other 5% isn't even close to important.