>>but the vast majority of the userbase is on the mobile website or app.

proving that the world truly is insane, I use old reddit on mobile as well as new reddit is more or less unusable on a mobile browser they hard force you in to their terrible app. If I need a mobile app I use a 3rd party app as the offical app is TERRIBLE

When/if they kill old.reddit is the say I stop using reddit, I would say my usage is already down 80% since the launch of reddit, as I pretty much only use the technical subreddits for news now, staying away for all other area;s of reddit.