Right now what we have been seeing is a warmup to what the Dems will throw at right up until the general.
The Dems and media have been trying to take Trump out for months. They attack him so viciously because he is a real threat to their cabal. Part of their lack of success is the fact that Trump's life has been public for decades--we know who he is, so it's hard to make us turn against him for telling us (for example) that he has divorced twice.
Don't kid yourself for one minute--the second Trump (God forbid) is out of the picture, they will turn their big weapons on Cruz. And Cruz does not have the benefit of having his life publicized for decades, so any negative about Cruz will be trotted out all over and he will crumple. He never did deny the National Enquirer infidelity story. That delegate grab in CO will be displayed as proof that he is a totalitarian. His over-the-top displays of religious fervor will be used to show that he's eager to impose a dictatorial theocracy on us. He's a much softer target for the media smear machine than Trump ever was. A Cruz nomination is a direct path for a Hillary or Bernie presidency.