One might recall Richard Nixon, who also had a less than solid track record as to conservative issues when he ran for president in 1968. He campaigned on a conservative platform as the champion of the "forgotten American," but once in office, he quickly moved leftward, embracing and expanding the Great Society, growing government at all levels, and starting such programs as OSHA, the EPA, and Affirmative Action. Nixon gave conservatives little to cheer about, yet there were conservatives, including Pat Buchanan, who defended him--and continue to do so.
If in 13 months President Trump starts to embrace and expand the Obama agenda as Nixon embraced the Great Society, how will his fanatic acolytes respond?
Simply put, they will make excuses for him, as they do now, and put his critics or opposition down, as they do now, much as Nixon's minions unfortunately did.
Good observations.