Are there any rock bands from the post-digital era that could fill a stadium?

yeah geir, like the music press hyping up bands, dropping them, hyping up newer bands has only happened in the internet age..

It happens to a larger and larger degree. Surely didn't happen a lot in the 60s and 70s, when many of the still stadium filling dinosaur acts were slowly building their careers.

I think in the 60s through the 90s, bands could do this without being around for very long.

Many of the biggest bands of the early 70s were so-called "supergroups" consisting of members who were already partly famous from other bands. Making it easier for them to establish a name quickly.