The Constitution specifically says that state legislatures are responsible for choosing how electors are chosen. Letting other states decide for them, or claim injury if they don't like their choice, would violate the Constitution. 
https://twitter.com/McAdooGordon/status/1336863698334478339
And of course, it's not just standing here, but laches. Waiting until after the election to file these lawsuits means that tens of millions of people could lose their vote, in which they have a liberty interest, without notice or a hearing.
That also violates the Constitution.
That also violates the Constitution.
And also, it just doesn't make sense to allow ordinary people to sue because one branch of government has usurped the power of another, without injury. We don't typically sue to vindicate other people's rights.
Conservatives understood this concept for emoluments.
Conservatives understood this concept for emoluments.
And finally, it is a little strained to call standing a "judicially created doctrine" when this whole brouhaha leans on extending the doctrine suggested in a concurrence in one of the most controversial decisions in national history.
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