Probably 2080 maybe but probably longer. We can still get the various sizes of 26" that aren't 559 (the common mountain version) quite easily and ISO 630mm is still available fairly easily though less common but I know we have probably 30 ISO 630mm tires in stock at the shop from 3 different manufacturers (maybe 4) 700c is an extremely common size so I would doubt they are going to get rid of 700x23 anytime soon. It is very very very rare that you will find a bike these days even some older bikes that cannot fit at least a 700x23. I am sure there were some odd specialist bikes that only went to 700x20 or something back in the day but I would say that is an outlier. I would say you are fine. There are currently 39 700x23 tires from 8 different manufacturers. available on QBP, one of the largest distributors in the U.S. I know there are others making tires like Specialized (who have a few options in 23mm) and if you want cheap tires Serfas still is around somehow and I know there are others, some good some bad. I would doubt the size is going away. However you may not have that bike in 20 years.