Those attacks will be back with a different and more developed spin. It's not enough to fight the last war. Trump has to be ready to fight the next war too. Right now, the media hate Trump and hate Cruz too. They may be going easy on Cruz to help stop Trump (which is a bad thing for both Trump and Cruz), but their hearts are not in this fight because they hate both candidates. When it's Trump v. Hillary (I hope), or Cruz v. Hillary (the only other acceptable choice), it will get far more vicious.
Of course they will be back. But they will be ineffective. The left has no new strategies to use. Race, Sex, Nazi, etc. The problem for the left tho is Trump is well prepared to negate all the historical attacks of the left in this election. He has been playing chess with an Art of War philosophy while his opponents have been playing checkers.