I saw the movie on Friday, it was actually surprisingly not bad. There were some moments I could have done without, but at times I was laughing out loud. Definitely glad they changed the animation.
Box office so far is doing well. I think it's trending toward beating Detective Pikachu for opening weekend for domestic. It has a chance to be one of the most successful video game movies ever (and a chance to take #1). This means it could get a sequel, which they've already eluded to being open to. This definitely opens up theme park possibilities.
That being said, I wouldn't want an entire land based around Sonic. A ride would be fine, if it's focused on actually going fast (eg Hagrid type ride) instead of just screens to simulate.