All true. There's little danger of the voting public perceiving Cruz as Goldwater.
But the issue you've raised -- and it's an important one -- is how the GOP-e would react to his candidacy. They could still perceive him as Goldwater. They're dense enough. And scared enough.
In any event, the GOP-e are the biggest obstacle to a Cruz candidacy. The primaries will be tougher than the general.
But if we all get out there and help Cruz win the primaries, in EVERY way that we can ( get started NOW...talking about him to friends, family, and strangers even and then give time, effort, and money ), then the general won't be nearly as difficult.......even IF the RNC/GOP-E work against him.