I tend to agree with this, I also think, that the bigger WoTC D&D gets the more conservative it becomes. They could risk being radical with 3.x because the market was dead or nearly dead. They attempted radical with 4e because their business model was burning out their customers but the 4e version was not only not as popular, but it burned out customers faster.I don't think it's just naming conventions that will factor into that. I think WotC got burned so badly by making a major break with 4E that, unless something dramatically changes (like sales drop to zero dramatic), they will want to have more continuity with the current version each time they push out a new iteration.
So we'll see stuff like the 1E/2E or 3E/3.5 transition, but those are editions where people quite easily used material from either side of the line interchangeably, although the market largely moved forward to the newest version over time.
From a business perspective they radically changed course with 5e, this was an edition to please the market, and it worked like a dream from a business perspective.
In the near future I do not see that changing much unless they really monetize the brand. By that I mean, that the most of their D&D revenue comes from something other than the game books, The VTT, hosting third party material, mugs, merch and other tat, boardgames or whatever.
If at some point the game books revenue sink below a certain percentage of total revenue, you might see a radically different game.
Does that mean no new editions? I really dunno but I do not foresee a new edition that is not "Backward compatible" anytime soon.