Trump will take SC quite handily, and then take NV. Carson and Kasich will drop out. Going into Super Tuesday, Trump will have big leads in almost every state, and have a lot of momentum, Cruz, Rubio and Bush will be battling for the also ran slots. Trump could very well run the table on Super Tuesday, forcing Cruz, Rubio and Bush to think long and hard about whether it is even worth continuing. Their money may very well start running out, as few people will continue donating to obvious lost causes, particularly Bush.
If it plays out that way, Trump will have more than enough delegates by time the primaries are over, the others combined won’t have enough to prevent him from getting the nomination.
Cruz will take Texas. Lots of delegates. Super Tuesday will reveal a lot.
At this point thats the most likely scenario. It doesn’t eliminate the ability of Cruz upsets in a bunch of states, or a Rubio one in a couple/few. But the upsets would actually have to happen at a statistically improbable (given the polls) level for Trump to not win a clear majority of delegates.
That having been said, a brokered convention without a majority of delegates pledged to one candidate is absolutely a legitimate mechanism for denying the plurality winner the nomination by seeking a coalition/consensus between the majority of delegates pledged to other candidates.