The story of this election was apathy and Hillary hate more than voter suppression.
Look at Minnesota, where there is very little voter suppression — election day voter registration, no voter id, you literally just need a registered voter to vouch for you on Election Day and you can register and vote. Lots of polling places, a very clean system, no six-hour waits in black areas.
Trump got fewer than 1000 more votes than Romney (1,321,015 to 1,320,225). He retained the core GOP voters but there was no big additional GOP turnout.
Hillary got more than 182,000 votes less than Obama in 2012. Where did those votes go? 77,000+ more to Johnson, 23,000+ more to Stein, over 53,000 votes to McMullin, 17,000+ more votes to write-in candidates. Perhaps some of those people voted for others as a protest of Trump, but Trump got basically the same amount of votes as Romney. Trump retained the GOP base,
Think of this. In a race with no organized write-in campaign, 17,000+ more voters took the extra time to write someone in rather than vote for Hillary. There were probably enough Mickey Mouses and Flying Spaghetti Monster votes to have changed the outcome in some states. Hillary only won Minnesota by 42,000+ votes and 27,000+ people literally chose to take extra time to vote for nonsense instead of filling in an oval for her. That has nothing to do with the merit of any third party candidate and more with Hillary hate.