You're not wrong, but that's a very one-sided view. The alternate outcome is that when the current mods abandon ship there's likely going to be many more people waiting in the wings to get their shot at modding their own sub. What other service is a perfect substitute for Reddit? The thought that most users will give up Reddit cold-turkey and stay away permanently is a bit naive. Internet use can be an addiction and addicts staying away under their own power and no alternative is unlikely. Ultimately a vacuum will be created, it will be filled with fresh bodies, and Reddit will continue along after a short period of unrest and uncertainty, with new mods running new subs.

"The time to buy is when there's blood in the streets."