That's like saying Forgotten Realms alternates between that, Toril, and the Sword Coast.
Not... really.
In the Realms "Nerath", "Nentir Vale", and "the Points of Light world" would equate with "Netheril", "Silver Marches" and "Kitchen Sink".
Forgotten Realms is the brand name, which means nothing in-world. Nentir Vale doesn't have that. Toril is the name of the planet. Nentir Vale doesn't have that, it was always just "the world".
They could give it a name or some branding, but the world was meant to be generic, so there's little they could call it that wouldn't either be gibberish or extremely hard to trademark.
I guess there's only so many gratuitous mentions they could throw in. Maybe they'll get around to Dragonborn from Arkhosia or whatever, eventually. Probably not, because...
Adding too much flavour to the Point of Light world was tricky, as it defeated the purpose of the setting: a blank canvas that DMs could make their own. It's like releasing a full-colour colouring book.
Between 4e fans necessarily including all those D&D-loyalists who adopt each new edition with enthusiasm, and there being no legal possibility of a Pathfinder-like alternative for any 4e holdouts, it was probably a no-brainer for WotC to decide to cater heavily to those feelings.
From what WotC has said about the response to their surveys, it sounds like the majority of players are not edition warriors who really hew to a single edition. So focusing a concentrated effort on 4e fans seems unnecessary as just making a new edition will attract most.
Lapsed fans are someone they do need to target, as they're not currently customers.
Six months from now, when the DMG is out and everyone's seen what they can do with 5e (or can't) is when WotC will likely take stock of the situation and see how everyone feels about the game. If 90% of former 4e players came along with the update and seem happy then making a concentrated and focused effort for those remaining 10% seems unnecessary. If 75% updated to Next and there's some unhappy grumblings from that group, then maybe something extra can be done.
Yes, it would be nice if WotC supported 100% of fans of all editions and settings, but that's unlikely to be financially viable.