If the states that voted for Clinton pass national popular voting, that would be 232 electoral votes, then it would only take traditionally blue states like Michigan (16) Wisconsin (10), Pennsylvania (20) to pass ballot initiatives.
Only twelve states need to change in order to eliminate the negative effects of the electoral college: Nevada, Oregon, Colorado, New Mexico, Minnesota, Virginia, New Hampshire, Connecticut, Maine, Michigan, Pennsylvania and Wisconsin
Compare that to the other avenues of change.
A constitutional amendment would require thirty four state legislatures to ratify it, which would have to include eleven red states, so that will never happen.
Building Democratic trifectas in all of the blue states to overcome voter suppression and gerrymandering will be also be extremely difficult because of the way the system is currently gamed. The next census will be in 2020, so it’s unlikely we will see things change for another fourteen years. That is, if we haven’t already seen the end of democracy before then.