Valentino Rossi winning the Dutch TT was a blast like holy shit I love MotoGP. It's become family tradition to visit Assen every year.
Motorsports will not become irrelevant anytime soon. There's this huge sales spike the day right after a race, hence why they made all the races happen on sunday (which is kinda inconvenient if you like to attend racing events because of work, school etc.) to get sales when everyone's still talking about the races.
Also ticket prices for the Dutch TT have increased by about 20 euros in the past ten years or so. I think this is evidence that there's still a healthy demand for motorsports, or at least, the Dutch TT. Kinda makes the whole deal pretty expensive though.