Take that same approach with FP+ reservations. Will I make reservations at 180 because I am afraid of not getting one? Yep. Will that fear create a demand for FP's for other attractions. Yep.
The current policy is that you will only be able to make FP+ reservations 60 days in advance. We will have to hope that Disney will NOT make ALL of the reservations available at that time, but will hold a certain number for same day guests. Guess we'll all find out when they roll it out. For us, we will see what happens, since we don't use the current FP system at all. We arrive early and hit the rides we want first thing in the morning, then we don't have to worry about it the rest of the day. If we miss one, that's OK, since we know we will be back!