PM is going to be popular if and when it first opens. I think they would most likely load from the center platform because of the shear size of the queue! Starcade would be a severe limitation to this.
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If the ride is really a big *improvement* over just a plain old peoplemover, then it might in fact need nore space for a queue. They might have to use the area where the rolling ball thing is. There is a great deal of underutilized area there.
Does anyone else remember when Space Mountain had escaltors in its queue? Back in the days when Tomorrowland looked awesome and crowded (but in a very good and beautiful way)? There was not all the wasted space (cringe) that there is now.