Probably not, but it's hard to tell due to the various factors. If not for Vietnam, we might have gone into another unsuccessful war that would have had the same effect and impact on society as Vietnam did in RL.
(1) Vietnam ruined LBJ's domestic agenda
(2) Protests of the war led to the invention of "hippies"--giving liberalism some bad PR (every liberal is labeled a hippy for the next 40 years
(3) No Vietnam = Great Society expanded + LBJ re-election in 68
(4) No Nixon comeback = no Watergate = no national distrust in government
(5) No Watergate = no sad sap Jimmy Carter Presidency
(6) No Carter = No opening for a Reagan presidency
(7) No sound conservative movement in the United States
1. LBJ still got a lot of it passed anyway.
2. Possibly, but I think the negative PR liberals got over the last 40 years had a lot of other causes as well.
3. Possibly
4. Possibly
5. There might have still been another incompetent President either at that time or further down the road, even without Watergate.
6. There were many prominent conservatives in the GOP in the 1970s and 1980s. Another incompetent Democratic Presidency or a poor Democratic campaign could have given them control of the Presidency anyway.
7. No. There were many prominent conservatives in politics even before Vietnam, and even without the war, other issues would have emerged that would have energized conservatives to a great extent, such as abortion, gay rights, affirmative action, gun rights, and taxes.
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