It depends, how long until it will not be fun anymore to see every sub turned into a meme?

I give it 2 days. After that people will stop tuning in as regularly.

Also traffic != money in regards of advertisers.

If traffic increases but the engagement lowers then that is a death blow to reddit.

The metric that got posted 1-2 days ago that engagement was cut down from 31 to 17 seconds during/after the blackout is huge and a metric the advertisers will look at.