I used to believe this as a fact until Nixon started getting re-examined by people. Like you said, people alive today don't know what it was like during Nixon's time as President we only know the spin. But now post-Trump people are starting to openly understand what was happening with Nixon the whole time is the same shit with Trump. Fool me once shame on you but fool me twice? Nixon didn't have the advantage of having the internet exist where people can freely report news and speak their minds as they wish, Nixon only had the MSM.
Nixon wasn't the only one that was smeared by the MSM, everyone successfully smeared by the MSM are starting to be seen differently to the public so it's hard for me to imagine all of this being forgotten in 20 years and everyone will just hate Trump because of what the MSM said. The MSM is losing it's power over people.