If the next Horizon game is like this one, I don't think I would buy it day one. We've done the sandbox thing, guys. Three times in a row. I think it is time for another Horizon with a *hushed* linear structure.
I felt this most strongly in the first few minutes of Fortune Island. That whole intro gave me a sense of purpose and adventure. But the then the "sandbox" opened up and my interest evaporated.
I just feel like FH4 doesn't properly guide me to actually do things. Some will say that it's a good thing that we've been given free reign to do anything in any car in any order. But, as I said, we've done this three times now. I don't think I can stand one more of these but with a bigger map this time.
Is a "guide" really necessary? The game's progression hooks aren't really complicated. You get into the game, it sends you to a few events with verbal and map prompts, then lets you go do whatever you want. There's not really anything more complicated about it than that - you do stuff, you get influence, you level up. There isn't really a critical path through the game, because it really doesn't care what you do, as long as what you do comes with Influence.
Aside from that, I agree that they can't iterate on the same fundamental design in Forza Horizon 5 again. FH3 is where the baseline current experience really got polished, and then PG bolted some minor changes onto it for FH4. Both games were well reviewed, but I saw a few reviews mention that they'll be disappointed if FH5 is the same fundamental structure again.
I'm hopeful that an extra year of development (assuming FM8 gives 2019 a miss, and we then go back to tick-tock releases in 2020), and making a shiny new game for the new consoles, leads to some bigger changes to the Horizon formula. I don't want it to become Need For Forza, though.
Bigger map, bigger servers, a more sophisticated open world. Maybe set up "race night" events within the world itself, where people can turn up when it's night time, and compete for rare stuff. You could also do gymkhana events, live in the world. Expand on the music festival thing, and make it feel more real - make the festival an actual hub for story "missions", with characters who aren't blandly cheery (for once!). Make it a place you can get out and walk around in. Give the story characters actual daily routines. Have "emergent" side missions, like happening upon an impromptu drag race or something. Give people a home, and let them show off some of their cars. Have a proper actual racetrack on the map itself (ie. Suzuka, if FH5 is in Japan).
Turn Forzathon Live into a slot machine with a bunch of different modifiers and "game" types (I posted about this idea weeks ago here) you can get - a big hourly race or game, with strange conditions and/or modifiers to the rules and physics.
Come up with some racing game version of end-game content!
Playground are slick racing game developers, but I'd like to see them stretch themselves into making some a bit more singular and unique.