It will be tier 1 like every single new attraction. I wonder if, after the new wears off, it will result in TSMM dropping to tier 2? They could almost do it now, except that it's the only ride you can go on with small children at the moment. Glad they finally added that third track.
Everything new has a rush. It was ridiculous to get a FP for the new Frozen ride and now I got one just a few days before without issue. Navi River is already pretty available.
I think FOP is going to be Tier 1 for a very, very long time. There are some rides that are just popular because they are new, but, some rides are actually really good entertainment. FOP is really good entertainment. 7DMT is really good entertainment for small children. I can't picture Slinky Dog getting quite the action that FOP has gotten. I rode that for the first time and hopped right back into a 3 hour line to ride it again. I think Slinky Dog will be more of a once is enough kind of ride.
I do like fastpass. I preferred legacy fastpass, but, I understand why they went the way they did. It was definitely a great way to get more people staying on property. We hadn't stayed on property before, but, that extra 30 days of planning and the ability to get a reserved time slot for a brand new ride was enough of a seduction.. lol
My kid was a colic-y cranky kid when she was younger. We couldn't wait with her in a line. If not for fastpass, I doubt we could have ridden many rides at all. Now she's 6 and she can wait in a couple hour line like a trooper, but, back a few years ago those fastpasses were a pretty big deal for us. My Dad hasn't been able to go to Disney in a long time, he has anxiety that gets pretty bad in those lines. With fastpass, he was actually able to ride some rides before it got the better of him.
When I was young and free, I was definitely able to ride a lot more rides without fastpass. But, older me can see that it makes a pretty big difference for people.
Honestly, I feel like the slinky dog coaster is more of a bandaid to give people more places to go to when Star Wars opens. Hope the capacity is decent. lol