I reckon when Toy Story Land opens up, the Slinky Coaster will simply join tier 1.
As to when SW:GE opens? Well, I can see mayhem. It could be similar to WWOHP at Universal, where you had to queue to get into the land. I have no idea how they will do it. If you think it’s hard getting FoP you ain’t seen nothing yet!
I’ve seen some predicting you’ll need to have an FP to get into the land, with a stand-by line outside, letting a few in at a time. I wouldn’t plan to be there until I’ve seen how it will work. Around 2021 perhaps