No way. Forums are still incredibly popular. Something like RedFlagDeals has an entire business based around their forum and get close to 40m page views per month and more than 3m uniques.

And there are at least 3 other hugely popular php based forums that I occasionally check — and those are just for my own niche interests.

Nextcloud, the mentioned Roundcube, plenty non-Wordpress CMSs, many internal tools I work with daily...