The letter is very clear about the protections afforded smaller states with regard to the electoral college.  It also touches on the spawning of the recent movement trying to advance NPV. The letter is in support of the electoral college as it is.  In fact as it concludes:

"It Underscores the importance of federalism to the founders and it embodies the balance they aimed to achieve through deference to states with smaller populations and by insuring that the interest of these states be reflected in national decision-making."

Ain't gonna happen.