Nope, this is perfectly constitutional. States have the power to cast their electoral votes any way it chooses.
I almost laughed when you typed that. Power has all but been wrested from states by unconstitutional judges. Of course, Dems will claim “states’ rights” all day for their cause and these bought-and-paid-for judges will suddenly agree with them.
The NPVIC text is by its own declaration an interstate compact, and as such is subject to Article I, Section 10 of the US Constitution, “No State shall, without the Consent of Congress ... enter into any Agreement or Compact with another State...”
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They could just flip a coin, I suppose. How's THAT for voter suppression? Not much worse than what they're pulling now, I suppose. However, at this particular juncture in US history, it's all moot.
At some point maybe it will be understood that a breaking point was reached during the previous regime, and the decision was made that fundamental reform was going to happen no matter what.
Hillary was not going to be installed as POTUS, period. No matter what.
The reform operation underway now will not be derailed by an election, assassination, FF, or anything else. No matter what.
This is where we are, and we all know perfectly well exactly how we got here. Whatever these states do or don't do, matters not a whit.