I think you are wrong if you are saying the MSM is going to promote Cruz to take down Trump. I have been reading the replies to articles at news websites and while they do not want any Republican to be president, they are TERRIFIED of Cruz. It really stands out.
Not in this story, it isn't. In both the Fox radio news "headlines" linked and this story in The Hill, even though Limbaugh had his highest praise for Cruz and in fact his praise for Trump was limited to how Trump handles himself with the media, Fox and The Hill and no doubt every other news outlet will spin this as All About Trump, when the reality is that Rush had far and away, no contest, the highest praise for Ted Cruz.
The MSM loves Trump's style, if not his political party -- his brash language and bombast gets them viewers. Trump's very status as a pop culture celebrity is 100% media crafted via his own self-promoting endeavors as a showman and an entertainer, successfully and skillfully pitching himself for about a decade as a brilliant businessman genius. That's great in a businessman and a showman.
In a president, it seriously risks electing a pure demagogue to the office.