Does anyone remember the park used to have a HUSS Enterprise... and interestingly, at the same location as the Green Lantern statue. The planter for it used to house the main arm.
They could also put something in Pistachio Park, the old Swiss Twist/Bayern Kurve spot. And I figure the building is not safe and would need far too much renovation, but I also thought that the old lower Dragon Station (just to the left of Jeft Stream) could be good for a teacup type ride.
But I've been complaining for years about the need for more flat rides. Especially when so many other SF parks have a much better selection of flats. I know they're not nearly as newsworthy from a promotional point of view, but if they got 3 at once (which would still be much cheaper than a single coaster), it could be advertised as a more major addition.
I've been noticing more serious lines for the few flats they have, so there's definitely a need from the GP there. Even Flash and Wonder Woman have been garnering lines.