The calculus changes, you see, depending on how many of those voting for Cruz are voting for him to win, vs. how many are voting merely to fulfill the GOP-e traitorous dream of stopping Trump.
You see, the available candidates are dwindling for Cruz, just as they are for Trump.
But there are two important differences.
1) Trump has the lead: even after losing Texas (Cruz's home state) by 500,000, his overall lead *in votes* (a measure of nationwide appeal, hence 'electability') is over 500,000.
2) The race is heading towards states more intrinsically friendly to Trump: Cruz was counting on a near sweep on Super Tuesday. He changed that to picking on all the minor caucus states. But a lot of the states are "winner take all" where the other candidates like Kasich and Rubio, split the anti-Trump vote: but they do so, as we have seen tonight, differently in each state.
What of it? Do we get an Ernst Stavro Romney and GOP-e Spectre, calling different focus groups state-by-state, having first one candidate, then another, dogging it from state-to-state to try to play musical chairs, out of an ego-infested, money-worshiping (Rubio is owned by Facebook's Zuckerberg) sense of spite?
Or do the rank and file, realizing that they are being played, and that Cruz unaided cannot win either the nomination OR the general, drop out and support a true populist choice?
There are 391 delegates available from true WTA states. Of that, you can probably assume Ohio will go to Kasich, so take away 66, leaving 325. That puts Trump at around 750 delegates after tonight if you assume he gets all of the other WTA states. So he would still need to get about 460 out of the remaining 913 delegates, or 50% of the delegates from the remaining states to win on the first ballot.