Quake 4 does not have any competition, any tournaments, any money and any development.
I don't see why would anyone care about viewers numbers on twitch or be judged by it. Unless as it seems you are a total DEBIL.
However, we can see by QC and DBT that they are utter failures.
QC is much less so, cuz ID pulled their shit together and made QPL with weekly matches and multiple LANS a year. It maintains a stable viewer base of 2000-5000 people. However, much fewer people actually play the game cuz it's so buggy and shitty.
But DBT died within a month of release, from 100% to 20% and then 60% less than 20%, lmao.
And also if you analyze stats - hours watched are dropping. That means while people still check on the diabotical to see how it goes, nobody bothers to watch it for long as the game is boring shit.