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YouTube is Losing The War Against Adblockers
(www.howtogeek.com)
This is a most excellent place for technology news and articles.
The comparison would be Amazon just removing non-prime purchases. It's not possible they'd convert 8 million of those 80, let alone 24mil. The people who aren't members have already decided Prime isn't worth buying.
30% isn't optimistic. It's impossible. 10% is "optimistic". They'd be more likely to net a drop in subscriptions when some creators announced that they were going to be forced to stop making content than they would to somehow convert 30% of people who aren't willing to pay for YouTube.