Well you have to remember that not everyone on a waitlist has no acceptances, so a waitlist acceptance isn't necessarily the end of the waitlist movement chain. For example, say that Person 1 had narrowed their acceptances down to School A on May 15, but then the following week they get into School B off of the waitlist and are given a week or two to make a decision; after a week, they choose School B. Then School A might contact Person 2, who happens to already be accepted at School C, and THEY get a week or two to make a decision. This whole process may go through several iterations before that spot that opened up at the top of the chain finally trickles down to someone with zero acceptances; I've heard of people getting in as late as one day before orientation.
However, as far as next cycle goes, you absolutely should be looking at the next cycle if you're sitting on no acceptences; in fact, honestly, you should've been looking at that for a while now...
Good luck in the waitlist game, though!