It's totally reasonable: users would be happier, YouTube can charge more for it (YT Premium+?), and YT analytics can detect when a sponsor segment (which many videos already label, and which are known to be about 60s long) is skipped and pass those metrics on to the content creator so the sponsor isn't being cheated.

Everybody wins. (Yes this doesn't work for heavily integrated sponsorships but it'd still get most of them.)