Romney just came out with some last-minute advice for Ted Cruz and Marco Rubio to attack Trump on his tax returns. Up to now, Romney is probably sitting perplexed on why tax returns were such a big deal in 2012 and yet no one in the media or any campaign has even brought up the issue in 2016.
Wake up Mitt! Cruz and Rubio won't attack Trump on his taxes neither will the media make an issue of it because Trump is exactly the guy the establishment has wanted all this time. Cruz and Rubio might say they don't want to run a negative campaign so they don't feel to make it an issue. The media won't make it an issue claiming that since Cruz and Rubio aren't interested, then why should they be interested.
Even if Trump is forced to disclose his tax returns and a "bombshell" is discovered, I expect the media to go on making excuses for Trump (as they have this entire campaign) telling us that despite the revelation, Trump supporters don't care and are still supporting him.