An interesting whatif. But I think so. Post 1970 the radicals on the left had moved to a much more aggressive style to bring the US down. Elections hadnt been working for them (and still dont)
Pretty much it, and besides, Goldwater and Nixon represented different wings of the GOP at the time, and though William Buckley managed to increase Goldwater's 'respectability' in the 1960's by booting out the right wing nutjobs like the John Birchers, Goldwater still wasn't quite ' there' yet to win a general election in 1976 either. Turns out Ford wasn't, either, but he probably came closer than Goldwater would have. By the late 1960's and mid 1970's Reagan's star was on the rise in the GOP and as Governor of a big state that was far more critical than Goldwater's Arizona. People tend to forget about Reagan until the 1980's for some reason, but he was also a beneficiary of Buckley's purge and more acceptable than Goldwater outside the Party loyalists. He was elected Governor in 1967 and again in 1971, and declined a third term, easily a better GOP choice because he could carry California's electoral votes for the GOP.