Just imagine it. At the behest of a bunch of celebrities (whose vast wisdom and foresight is well documented), the Republican electors defy their oaths en masse, in order to expressly deny the voters their Democratically elected presidential candidate. A man who won the election specifically because the people that voted for him imagined (right or wrong) that the two traditional parties are so unified in their view that their votes don't matter in the first place.
Trump won because middle America was unwilling to accept their role as the 'bad guys' in the progressive narrative. They believe that because both Republicans and Democrats submit to this view, and that they're being treated worse than other Americans, without good cause. This effort, if successful, would make them certain of it.
But for the #NeverTrump movement, our idiot celebrities would never consider this tactic. They don't have the creativity for it. They are bolstered only because the Republican party was so deeply split during the election between the establishment who accepted the liberal narrative, and Trump, who did not. But for that, they'd be busy burning all Republicans at the rhetorical stake as racist, misogynist, homophobic monsters. Instead, they've found what they believe are "tolerable" Republicans and it's to them that they're making this appeal.
Luckily, it will probably come to nothing.