I see the phrase "That's not good enough" used quite a bit around here, and I can't help but feel it falls into a bit of a weird zone.
Trading established for the unknown is usually very difficult to get a return that feels like enough --- especially when it's your guy. The returns for other teams' guys don't usually feel that way, but I've yet to encounter fan bases who consistently feel they received great value for their better players. There's almost always mixed emotions.
That's understandable, because trading for the unknown seldom provides comfort.
But the object of trading established players rarely comes down to getting an exact match for talent at the time of the trade. Usually it's about timing, contracts, depreciating values, or a combination of multiple factors. But it's very hard to go into a situation, even with a superstar who has term left on his deal, and feel like you're coming out ahead.
That's not to say it doesn't happen, especially with time, but in the immediate time frame before and after the deal, there's typically an underwhelming feeling.
In that sense, any trade involving Chris Kreider will likely stir up similar feelings. It's why the concept of rebuilding always seems more appealing in theory than in reality.
Even if the Rangers got fair market value for Kreider, I'd say it's extremely unlikely someone here would come away overjoyed.