He'll keep a certain level of support just through the sheer laziness and ineptitude of people. Unless you carefully monitor your financial accounts, you can easily forget about signing up for something and it keeps being taken until you do or your card is cancelled or expired. It's why companies love the subscription model, because a decent percentage of subscribers giving you money don't even know or remember (esp. common with company accounts and services). Because of that, there is a window of time where he'll have a certain number of subscribers even if he doesn't produce anything - remembering too that if you pay him money, you're obviously not the smartest tool in the box.
Long term, it'll be a slow bleed as he fails to attract new subscribers because he doesn't produce regular quality content and there are better and free alternatives. His knowledge and claim to have insider info also has a sell-by date.
If you were a vegan activist, would you bother listening to someone who worked at McDonalds 20 years ago? No, because what can they provide that is in any way relevant?