So using that reasoning, if Cruz loses NH and SC he drops out, right?
Cruz has a national ground game and stable temperament. Trump has neither. I don’t think Trump could even handle losing a couple more states, whereas Cruz can and will soldier on till there is no further chance of victory.
Also Trump is not a conservative, Cruz is. Trump’s support is mostly personality driven, another couple trumpertantrums and people may view him radically differently which would drive down his poll numbers. Heck, at this point I am not even sure Trump could stand a slew of national polls that didn’t show him leading.