Old reddit is still around but reddit's leadership made statements lately suggesting we should expect old reddit to start sunsetting. For me, old reddit constantly flips to the crappy new reddit and within the 10-20 minutes/2-3 days I spend looking at it I have to manually revert my preference back to see old reddit maybe twice a week - despite old reddit already being set as the preference. To me, that signals they want users on new reddit, which I dislike, so I'd actually just leave the site entirely without old reddit. It's already gone severely down hill in the last 5 or so years to the point I barely use it.