You very much are not. However, that's how things always work out, a new theme appears and fascinates people, then everybody and their mom start using it for many years until it gets strip mined. Another comment mentioned zombies as an example, you can hardly see new zombie apocalypse stories these days because it's been overused already, before that i believe it was vampires, and other prominent themes have preceded those and passed. Isekai as a trope is still extremely popular to the point that stories that don't even need it get it tacked in as a prop to help it get popular. It's the way these things happen, and will continue until the next fun thing appears. Then it becomes just another trope to be used at the right time.

It too will pass.