My latest guess at final delegate count shows that even with California, Trump can’t get to 1237 with WI going to Cruz. If CA goes for Cruz, it is feasible for Cruz to overtake Trump in delegate count.
I think under either circumstance, Trump is not the nominee. If Cruz overtakes Trump but is not at 1237, I think he will still be found acceptable to the establishment, esp. if he takes Kasich or Rubio on as VP.