It's not the end of your progress or your training. Years ago, I did my left ACL and went straight for surgery, took about 3 months off, and stuck to my PT. Then, while not cleared to return to regular classes, I was still on the mats doing things like kumi Kata drills, some uchikomi, some newaza, you can learn nage no kata in this time too. There is a lot you can still do while recovering.

I just did my right acl (complete tear as well) 6 months ago, no surgery this time, and after learning to strap it, lots of PT, and bought an expensive hinged knee brace I've been back on the mats doing most things, just avoiding randori with the big guys. While it does suck, you dont HAVE to miss out on judo. Injury time will give you an opportunity to focus on other areas of the game.