Honestly - with 900 guests an hour the ride is running right where Toy Story Mania was at Studios before the third track opened.
So it won't be impossible to ride. But Epcot has always had significantly more guests than Studios on a given day.
Comparing this to Toy Story Mania in term of capacity is scary. I think with TSM there was a "wait and see" mentality when it came to capacity. If the wait times slowly died down, they could leave it at two track but the option for a third was always there. TSM never died down and this one won't either because it is one of a few family dark rides in the park and Epcot is always busier than HS. The issue here is, they can't add another track. They can't do anything. They are stuck at 900 guests an hour forever. Just wait until Frozen 2 hits theaters. I expect to see this hit 300+ minutes again quite often. It either needs to become the first FP+ only attraction and off the tier system so they can manage times or they need to drop FP+ on the ride and make it standby only. Having both a standby and a FP+ is just causing a ton of problems. Not to mention the fact that it keeps breaking which is KILLING the capacity. Going to be a bumpy summer for Epcot