I agree we need a good backup goalie, but I don't think that backup has to be a younger guy who still holds intrigue as a potential starter and whose value would be likely to steadily decline the longer he isn't getting a chance to play more.
In other words, I think we can probably find a backup who brings what Georgiev brings now, but doesn't necessarily bring the possibility of what Georgiev could bring in 2 or 3 years. Essentially, we're holding onto an asset whose "added value" we're very unlikely to use or benefit from.
So if we're looking at this from a player rating standpoint - do you keep the 24 year old goalie with an 80 rating (but who could reach 85 rating if given the chance to be a starter), or do you trade him for help elsewhere and sign a 30 year old goalie with an 80 rating (but who isn't going to be a starter and hopefully maintains the rating for a year or two). The upside of the younger goalie is nice, but you're not likly to see it on the Rangers unless Georgiev is starting --- which he likely won't. However, he does hold value for another team who can give him that opportunity, and in turn, provide value to your roster elsewhere.