Once the very blue, very populous states like New York, California, Illinois, New Jersey etc. pass all of these then smaller states will be completely ignored in Presidential races. Someone, somewhere will file suit when their state voted for candidate X but Y won the popular vote.
The courts will pull the same stunt they did with all the lawsuits over Obama's Article II eligibility issue.
They'll just gavel the People down and tell them they have no "standing", i.e. "you are not the Democratic Party of the United States".