I honestly don’t think the FB ride will be Floo-based — after all, we’ve already experience Floo in FJ when we are transported to the Observatory and then from the a Great Hall to the Room of Requirement.
Also, as for a Mario Kart attraction, let’s remember that they have to set up some sort of a story - or rather, it would make a lot of sense for them to set up a good story for the ride. The most obvious idea would be that Peach has been kidnapped and somehow we are racing to save her, but there have been so many iterations of Mario where Bowser and Mario are truly just friendly rivals and they compete for fun. It’ll be interesting to see how they treat the characters in the ride, or if there will be any sort of MacGuffin we’ll be racing for. It would be very cute if we were trying to rescue something/get something from Bowser’s castle and, as part of an interactive queue, we had to help Captain Toad and his friends progress through various puzzles in the castle using Nintendo Switch compatible micro-games.
I also wonder — are the same people who are deeply upset about RotR’s use of the new trilogy in stead of the original one going to be the same people that get upset at Epic for using the wrong Wizarding World location, the wrong Berk location, or the wrong locale in Mario? It seems like the fans of these properties aren’t going to be as rabid about “doing the source material justice”, and perhaps this puts universal at an advantage because there are “lower expectations”...?
With regards to SWGE and the Fantastic Beasts land/HTTYD/SNW Locales:
1: Universal has already made 2 lands and several rides with the OG Harry Potter characters and locations, Hogsmeade and Diagon Alley. They didn't do Fantastic Beasts first, nor did they chose to do an "original Wizarding world" concept. They put us right into the films. At DHS we only have Star Tours for any content not relating to the Disney Trilogy.
2: Even though its not as popular, Fantastic Beasts is technically its own franchise or an expansion on the wizarding world, where the Disney Trilogy for Star Wars is still a part of the main Skywalker saga. So its not the "wrong" wizarding world locale. Also, the setting is Paris, which is famous for many reasons other than Fantastic Beasts, so this should appeal to masses beyond the Potter franchise.
3: Im not sure the location for HTTYD has been revealed yet, but New Berk would be a tad disappointing.
4: Im a massive Nintendo fan, and to me, they seemed to have hit the nail on the head for the Mushroom Kingdom. To consolidate all of Nintendo into the land they seemed to have, is quite impressive. Plus we still have Peach's Castle, Bowser's Castle, and DK Kingdom.
In general, I think Disney completely missed on the connection to Star Wars. They made a very nice land, with arguably the best ride in the world that does embody Star Wars, but the land itself does not do the property justice. Thats just my opinion, and I don't think its as comparable to the other lands here at Epic Universe. With no disrespect, HTTYD is NOT Star Wars. So flexibility there may indeed be more warranted/accepted.
TLDR; It'd be like Universal opening up Fantastic Beasts land FIRST, and before (if ever) Hogsmeade and Diagon. Instead, they've done those, so now they're moving onto others. I just don't think they're quite the same thing in my personal opinion where Disney could've done ANYTHING Star Wars and they built Batuu around a trilogy no one cares about. In my opinion, they're just not comparable.