As for "What's Next?" in terms of a big ticket item? Or a Haslab? I think those could be conversations that are distinct from one another.
BIG VEHICLE FOR RETAIL
I think it's still possible. The Mandalorian's N1 starfighter seems to have done reasonably well. Hasbro also took the plunge with the E-Wing from AHSOKA. And both of those came with a price tag over $100.
But what might be a good candidate for retail now? There are a number of vehicles that have been made before which have never been offered in TVC. And I wonder how much the community would embrace an upgraded version of a previously released vehicle. Would people want an improved TVC Darth Vader TIE, Jedi Starfighter or A-Wing?
And equally, there are vehicles that haven't been made before in the starfighter line - the Outland TIE, TIE R/B, Pirate Snub fighter, or the RP82 Fiend Fighter.
Larger vehicles might be an option. The ones that come to mind are an upgraded U-Wing, or Luthen Rael's Fondor Haulcraft.