Okay, sure, names are useful. But 5.5e isn't going to predominate. The "precedent" is a single edition, and notably an edition I often have often seen others refer to as 3.X, because they include both the before and after into a single group.
Meanwhile '24 DnD, OneDnD, anniversary edition, "the new rules", those are very viable contenders for simple, straightforward names that are descriptive and have a single, quite large advantage over the other two major contenders. And that is, unlike 5.5e or 6e, they don't have the baggage of a specific perspective/take on the game. Most everyone who I see using 5.5 tend to have very specific, often negative, views on the ruleset coming up, and the company in general. People who have picked up on that (like myself) are going to explicitly avoid using those terms. And since it is the people who like the new rules, and want to spread them who will be giving the name out to people, not those with negative views.... shrug I just don't see 5.5 catching on.