It wasn't ideological Conservatives that cast their lot with Trump, it was rank-and-file voters. Turns out they greatly outnumber ideological Conservatives of any one flavor, don't give all that much of a shit about what ideological Conservatives want them to do, and the internal divisions and purity tests of the ideological Conservative factions blew any chance of stopping Trump before he got the upper hand on all of them.
And honestly an awful lot of those ideological Conservatives won't be disappointed at all, because they never supported him anyway, and will take a schadenfreude-like joy in bitching about everything he does. But that's human weakness, and life in a country that actually has elections. No, they'll just run around complaining about every perceived deviation from their own dogma for the next four years if Trump does get elected, a dogma to which the candidate and the bulk of the voters never submitted, ultimately to the aid of nobody but the Dems.