Ironically all his talk could depress his own voters turnout more than Clinton's - if your own candidate is saying it is all rigged anyhow not great motivator to go out and stand in the rain.The only outcome that would suggest a rigged election is if Trump wins. Period. End of story.
Btw I've no idea who these people are voting for (this precinct went for the GOP in 2012) but nobody should have to wait up to 5 hours to exercise their constitutional right to vote.