Trump has shown he can handle this issue already by how he shut down Hillary trying it so fast early one.
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.