This thread reminds me of one of the most heating discussions in sports: the argument in baseball between Big Hall (baseball HOF) people and Small Hall people. I am most definitely a Big Hall guy and so, turning to hockey, strongly believe that if he has more productive seasons, CK should, and will, have his number retired.
You can't judge someone just on winning the Cup, just as you can't judge how successful a season we've had by if they win the Cup. Only one team is left standing at the end, and if that is your criteria, you are dooming yourself to a life of frustration. You take your happiness where you can.
Gilbert, Hadfield, Ratelle, Giacomin, Howell, Bathgate, Lundqvist....no Cup. Howell and Bathgate never even played in a Cup final (in the days of the Original Six, you only had to win one round to get there).
The only sport where we realistically judge players, in particular QBs, by championships, is football. Was Eli a HOF QB because he won two Super Bowl? I think yes but others strongly no, ONTH, Marino and Fouts never won Super Bowls.
CK has been an outstanding Ranger. Yes, frustrating at times. But for those who never saw some of the old timers with numbers retired play, it is easy to think that they were always great. Not so. Gilbert was inconsistent. It took Ratelle years to become a top center, Giacomin never had that "carry your team" playoff, was always somewhat disappointing in that regard, Howell was booed consistently (that's even before my time, but I heard many stories about the MSG crowd in the 1950s yelling "hit'em with your pocketbook, Harry) but he did play over 1000 games. Guys with numbers retired, or HOF players were not always great or consistent: they had down years and periods of less than great production,
Step back a second and appreciate what we have in CK. Hopefully he has a few more productive years. Maybe we will win a Cup as our window opens. But, even if he doesn't, I vehemently believe that he is an all-time Ranger great and should, one day (with the proviso of a few more really fine years) have his number retired.