Population growth cycles are usually pretty stable under typical conditions. It’s hard to overstate the number of cicadas emerging with these two broods aligning this year, this will be a population growth cycle on steroids for predators, which is why it’s remarkable. Next year, with so many additional predators, they will negatively affect the populations of other prey due to increased predation, which will negatively affect predator populations the following year, etc. The point is the population disruptions in these ecological systems will be large
One of the theories as to why these periodical cicadas evolved these lengthy reproductive cycles is because they avoid elevating predator populations long-term.