If the EC selects Clinton, it will be a disaster on every level. This will mobilize a right-wing electorate that will march to the poles in 2017 and take every state house and governorship up for grabs. In 2018 there will be a major push in the redder states to take all of the Dem's senate seats coming up for reelection. The Republicans in the House and Senate, feeling the same anger described above, will dig in their heels and make the obstruction of the last six years look like bipartisan compromise. The courts will suffer as nobody and I mean NOBODY will get confirmed, vital agencies will be leaderless and the whole US government will grind to a standstill. And then we get to talk about 2020. Trump is a buffoon who wants to loot the treasury and enrich his Wall Street buddies. He's also a Hollywood guy who has been hanging out with the Hollywood crowd for 20+ years now. He's going to get his Supreme Court guy who will move the country to the right, he will fight the regulatory apparatus, and IMO, not even look at the social issues everyone seems to be freaking out over. You SHOULD be freaking out over the environment, education, and consumer protections he already has his sights on. Unions are in for a rough time as well. The way we fight Trump is to use him as a rallying cry, just like we did with Bush. Rebuild the state Democratic parties, run for the state houses, build an infrastructure in the rust belt and the South, then run a 50 state strategy with all 435 House seats up for grabs. Make the election not about Trump but about the country and fight. Clinton ran a poor campaign, one in which she was expecting a coronation not an election. She did not help push the Senate elections, she barely helped the House, and then called people on the fence about her "a basket of deplorables" which made some of the people who were going to vote for her as the "not Trump" candidate decide instead to not vote for President. She could not hold a big rally in October into November, and there was zero excitement about her campaign outside the diehards. She deserved to lose, as much as I hate the words "President Trump" and as much as I think he is going to be a terrible leader. But hell, maybe he will rise to the occasion and be "mediocre." As an American who likes the country I live in, I don't want my President to be a failure, even if I disagree with damn near everything he stands for.
Republicans have won their last two presidencies because of the Electoral College. I highly doubt the Republican Party establishment will want to abolish it. Our best bet to abolish the Electoral College is the National Popular Vote Interstate Compact, and that's a long shot in and of itself.