I've split the Fright Nights stuff into its own thread, because why not!
It's certainly possible. I know in the past, they have considered a more broader family friendly attraction, and you could argue that things like the Amity High dance show fit that too.
At the same time, Thorpe and Fright Nights are still gearing towards the more older / young adult market, and always have done, regardless of who visits. It would be a very stark change to create something for a broader market.
The last year they had mazes with IPs was 2019, which was the last year of The Walking Dead maze license. I remember hearing rumours that Do Or Die (the partial outdoor one by Rush) was being considered for 2020 before Covid happened and changed things. Obviously Living Nightmare was going to be replaced by Black Mirror regardless.
I also think there was a time when the park tried getting Stranger Things for Fright Nights too, or if not, at least ripping it off in some way.
So perhaps Covid played a bit of a role in a lack of IPs over the last couple of years. But it has equally shown how the park do have a good creative side to them, and the original stuff can work. So it would be interesting to see what happens if they did return to using an IP.
As for the Lionsgate thing, I'm not too sure. The standard length of many IP contracts within Thorpe (especially for the mazes) is 3 years, with possible extensions.
2013 and 2014, the park leaned in very heavily with the 'Thorpe Park Movie Studios' motif, and pushing the IPs. 2015, for whatever reason, they went away from that and introduced the Big Top. The space used previously by Asylum and Studio 13 was now used for I'm a Celeb, so they needed something new for a headline attraction. Maybe the short term plan was to edge away from IPs at Fright Nights, or the Lionsgate films just weren't as big a hit as they wanted for the cost they were paying?
What I think should be kept in mind is that Thorpe and Lionsgate still have a reasonably good working relationship. They still have Saw going very strong, and that's clearly mutually beneficial and is regularly renewed. They scrapped Blair Witch for one year to focus on Walking Dead, but then bought it back. So there wasn't necessarily a bad reason for it disappearing. I guess it was just a creative decision when it boils down to it.