One can certainly hope so!
Don't get me wrong, I love the 'Realms as well as Greyhawk. I just think that if WotC really wants to keep mixing and matching elements from campaign worlds they really should just reintroduce Spelljammer or something to reconnect all the worlds, and if they want to include an element from the Flanaess in an adventure in Faerûn then they should acknowledge where the element came from and tell how it got there.
A simple Spelljammer book and there you go, your adventurers from Waterdeep and the Dales can go off on an adventure to Castle Greyhawk by first having an adventure traveling through the Phlogiston between Crystal Spheres, and fending off a raid by Gith pirates. It would not only allow for such connections, it would introduce new elements to enrich the adventures.
They could even hearken back to the original ideas of the Forgotten Realms with long-lost hidden
Gate networks connecting the 'Realms to Earth, which Ed Greenwood imagined allowed for tales of mythological creatures to filter from Toril to ancient Earth, not to mention allowing the ancestors of the Mulan humans of Toril to travel there from Ancient Egypt. After all, Elminster needs an easy way to get to Canada so as to meet up at Ed's house with Mordenkainen and Dalamar to swap spells and eat pizza!
(As far as my home games are concerned it doesn't matter, as in any campaign I have ever run, set in any world, I have always maintained the idea that all the worlds still retain the existing connections that they had in 2nd Edition through Spelljammer, even if no characters are aware of Spelljamming ships, or even if they will never ever encounter one... all the other worlds are all still out there, including Earth. It's just too useful and wondrous a concept to get rid of!)