That's possible. You certainly can have a bunch of motions stacked up. I don't think I've ever seen WSFS go more than about four or five deep. I heard at meeting of the local chapter of NAP that some lunatic figured out a way to get more than 100 motions on the stack.
Previous Question can be called upon just the most immediately-pending motion, or on the entire stack, or anything in between. If not specified, it only affects the immediately-pending motion, but it then yields to a motion for the Previous Question with a broader scope, so if there were five motions in the stack, you could conceivably get five more PQ's moved in increasing scope. I hope nobody tries such a stunt, though.
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Previous Question can be called upon just the most immediately-pending motion, or on the entire stack, or anything in between. If not specified, it only affects the immediately-pending motion, but it then yields to a motion for the Previous Question with a broader scope, so if there were five motions in the stack, you could conceivably get five more PQ's moved in increasing scope. I hope nobody tries such a stunt, though.