That's a take worth considering, but I'd be careful with assumptions like that. The reasons for an increase in demand (if there is indeed one, and not just an illusion of one due to supply issues) could have their origins elsewhere. For example, I've read that PlayStations are selling out in record time too, and I doubt that tech is all that revolutionary. Perhaps people are frustrated with the pandemic/politics/inflation/stagnation, pick your scenario, and need an outlet.
But to your point, mirrorless does seem like the next evolutionary step and a valid replacement for SLR. If I were a pro photographer, now would certainly be a good time to consider switching platforms.