Possible GOP comeback?

[Middle-aged Europe]

Society is always changing and evolving. If you want to call that "becoming more liberal", so be it (although it would be a simplified description of the phenomenon).

A reversal of such societal changes is pretty unlikely. For instance, there won't be a rollback on gay marriage/civil unions, just like you shouldn't expect racial segregation to be re-introduced or women's suffrage to be repealed at any point in the future. In a sense, conservative movements were never able to prevent social change, they only succeeded in slowing it down.

Of course, all of this hasn't much to do with a "GOP comeback". The Republicans will hold the more conservative position on political issues for the foreseeble future and they're also going to win elections. The definition of "conservative" can and will change over time though.