The only way I could see the park getting an out-and-out thrill coaster is as a replacement for their SLC. That's the closest thing they have to one currently, so it would serve as a like-for-like replacement. Obviously with it receiving a retheme this year it's unlikely to go any time soon, but in the future it'd be great.
As for the theme for this, I don't expect a Nick IP. If they go for an IP, I could see it being something bigger, with wider appeal. And that won't cause an issue - the park have done fair work with 'one ride lands' such as Star Trek and Excalibur. Even the Paw Patrol rides, which is a Nick IP, has its own sub-land feel.
I'd love for the park to invest in a non-IP ride though. A slightly corny "you're at a movie studio and things go wrong" story would be perfect for the park, and also could fit this ride really well too.