Funny thing. When you said this I wondered if it would be a good way to stop using Reddit. Then I remembered like generations ago I tried to stop using some website by making it hard to visit. Blocked it in the hosts file and everything.
One day I stopped what I was doing and looked at what it was. I was on the website I'd blocked. The way I'd done it was I'd forwarded the Xserver from a dedicated server I was running elsewhere and was browsing on a remote Konqueror or Epiphany or some shit.
It taught me something interesting about my Akrasia - the problem isn't a lack of focus on a specific task. It was a task choice problem and a long-term incentive awareness problem. I wasn't even aware I'd done all of these things to access the site I'd blocked. I'd auto-piloted through them. Fascinating.
Same, and I feel like it's inevitable at some point. Either some day someone will do the math and determine they can get a lot more ad revenue if they force everyone to use the new design, or they'll decide the cost of maintaining two versions of the site's frontend is too high.
The cost is probably relatively low (but not negligible). I could imagine a future though where they decide to make some big breaking changes to the API, and decide it's not worth updating the old site.
I started browsing the site on mobile without the extension on the new site because it makes Reddit's attempts to manipulate me more obvious and more annoying.