The establishment crowd don't have to "warm up" to Cruz, there's nothing about him they need to change.
That H1-B stuff was his wink and nod to them so they'll see if a few bucks will buy them anything from Walker who is in reality far more Conservative and less "pragmatic" than Cruz so it looks like Cruz had some opposition but they'll put the real money they intend to pour out behind Cruz. Just a matter of time and whether or not it's obvious right away.
Walker went toe to toe with the vested interests everyone said no one could ever challenge, never gave an inch, and won. Cruz gives a good speech.
Cruz is the only choice ? Fine, when people who vote for Cruz are more pissed off and pissed on than the people who voted for Dub ever were I suppose you can post under another name to avoid embarrassment.