If Jeb faces tough sledding.... the establishment may pick Romney as a safe choice.
No way will they go for Cruz.
If a Conservative Republican can't win either the GOP nomination or the presidency in times like 1980 (shaping up to be very similar in 2016) then they cannot win ever, and it will certainly be time to (1) scratch the extra-constitutional presidential primary tournament process, a creature of progressivism and of the Democrat Party; and (2) scratch the GOP.