Some of them may say, "yeah, give him a chance". But most of them will say, "hell, no." If, at that stage, it looks like Clinton has a clear lead, these people may stay home. But if it looks like Trump has a chance, expect them to head to the ballot box (especially when the excellent Clinton GOTV operation will be reminding them to).
Yeah, yeah, sure... excellent GOTV, ground game, outperforming in ads.
But it is... subject iv. Especially, when the candidate doesn't seems so enthusiastic to his/her voters...
The best GOTV "operation" so far was "deplorables"