Gunsnewing, I don't see the same dilemma that you see.
Compared to CP3's likely salary, Shumpert if he is the player we think he is represents a huge financial opportunity for the Knicks. Boston had 3 superstars to start, but rookie Rajon Rondo quickly brought the number of exceptional players on the team to 4. Shumpert is capable of making a valuable contribution either as 1 or a 2, or a combo guard, or even as defensive stopper capable of keeping another teams "scorer" in check. If Shumpert gives the Knick an opportunity to get an excellent player for less for a couple of years, I expect the Knicks to refuse to part with him the same way that they refused to part with LandrFields. Its true that the Knicks did part with some excellent quality players like Gallo and Will, but it was about time for both Gallo and Will to be paid a salary approximating their actual worth.
Also the Knick's situation is quite differing when it comes to adding a third elite player, compared to our experience adding our second star. First the Miami Heat have a lasting economic advantage, because of the discounted salary that Lebron, Wade and Bosh voluntarily accepted. So it is critical that the Knicks find role players that are excellent economic values relative to their contributions such as Landry and hopefully Shumpert. I suggest that if Shumpert has a successful first year, the Knicks will try very hard not to turn him over in trade. It will likely make more sense for the Knicks to use the majority of their remaining financial resources toward solving their shortage of big men.
Assuming that Dolan will make an ass of himself a second time, and will give away many of our other assets ain't necessarily so. It clearly was extremely important to Melo to leave Denver on good terms with both the Denver fans and Denver management. We put up with Melo's loyalty to his former employer, because Dolan was so anxious to secure a second star as was Amare as well. I think that the Knicks including Mr. Dolan will learn from their past mistake. Adding a third superstar is also a less essential ingredient for the Knicks, particularly now that Dallas has proved that 2 superstars are enough to win the title if you surround them with quality players. It doesn't mean you are wrong. I just think that everyone knows that Dolan was a buffoon when he took over the negotiation. Donny Walsh found a way to make that point crystal clear. I don't think it is obvious that we will again sell our valuable assets at discount prices.