At the very least, Kreider is an inconsistent 20 goal, 40-45 point player. While frustrating, it's not as if he's completely useless and popping in single digit goals/points.
Kreider, for better or worse, is in a similar situation to Nash. Even though there's production, he has two big strikes that are usually called against him --- consistency and expectations.
Like Nash, he tends to score in bunches, with long stretches of goose eggs. The end result is stats that look good on the surface, but lose some of their shine upon closer examination.
The million dollar debate at this point is upside and value.
With regards to upside, there's the question as to whether Kreider is what he is, or if he is capable of 25 or even 30 goals.
There's also the question of whether people can live with him if he's "only" a 20 goal, 45 point player.
As far as the second question is concerned, we can debate how other teams may view him. If there is a general consensus that Kreider is a 20 goal, 40-45 point guy, the returns aren't going to be as high as some people may want to believe. You're most likely going to get a similar player, with similar strengths and weaknesses.
If you're going to move him, the biggest hope you can have is that there's someone out there who believes in Kreider's upside and is willing to pay a little more. But even then, I'm not sure the return is as great as some may think.
Even if Kreider is the player he's going to be, I have some concerns that we're approaching this with the mindset that the grass is greener on the other side. I'm not totally sure that's the case.