As you know, there used to be far more stages, so inevitable there were more stages that could be cancelled. Though as a percentage of an event's SS length, less would have been lost in the past. So it'd be interesting to know on percentage terms.
What I mean by increasing risk of cancellations, is that with live coverage, more information from the stages (organisational and spectator via social media), plus SOS from cars, combined with modern liability issues, it's never been easier to justify cancelling stages. It's a slippery slope though.