Does it really matter though? Next week Safaris will be at over an hour. EE will probably be over 2 hours. FP+ will be blame because it's there regardless of what is actually going on on the ground.
No, no. No one should blame FP+ for appreciably different Standby lines. FP+ does not add people.
However, FP+ does change people's patterns (as it was designed to do) so it might slightly affect lines one way or the other.
For example, any WDW expert who was use to always getting a FP for TSM (like me!) might find it more difficult to get FP+ unless they stay onsite. They might skip the attraction completely. Alternatively, some who skipped TSM because they never could get a FP for it might now be guaranteed a FP+. Depending on the numbers affected one way or the other, some Standby lines might be slightly longer or even shorter.
It's really difficult to be sure which way Standby lines will go on attractions that previously had FP because it requires knowing which group is larger and will dominate the system. Most numbers should wash and we'll end up with Standby lines roughly the same.
What will be interesting to observe is the lines at the FP+ kiosks.
The old FP ticket dispensers were pretty efficient. Even if there were 5 people ahead of me, I could get to a machine in a couple of minutes, often in less than 1 minute.
The FP+ kiosks are more user-interactive. What rides do I want? What times? Multiple screens, multiple buttons. To me, they seem obviously more time-consuming to use than sticking in a card and having it print a piece of paper.
I'm worried there are not enough FP+ kiosks.
Disney clearly is thinking along similar lines which is why they have extra CMs stationed
and are distributing paper sheets to help guests make their selections prior to stepping up to a kiosk so that knowledgeable CMs can aid in the selection process.
Disney looks like they're getting ready for crowds, like they are trying to improve the efficiency of the kiosks. Good to see.
Will it be enough for next week? We'll see.
However, unless they intend extra CMs and paper to be part of the permanent process, they either need to build more FP+ kiosks or let offsite guests select from home.