But since you disown the compliment, I'll proceed to demolish your contention.
I am sure you'll agree that the words conservative and liberal are relative terms. That being the case, one could make zany conclusions, such as, if all those who are considered conservatives are vaporized in one moment, the very next moment
they would be replaced by a whole new set of conservatives, all of whom would have been former liberals. That is, liberals who were among the most right among the liberal faction. Thus, conservatives and liberals are counterweights in a political system, divided by the center line, whatever it may be at the time. That never changes, no matter how the issues change.
Since 1935, liberals--I use the term in the modern sense--have had a political advantage, supported by a majority of voters, in carrying out a progressive agenda, adding one social program after another and creating new agencies to administer them. Conservatives by and large have gone along mainly through mitigating compromises, but always somewhat reluctant and warning that the central government is getting too big, too intrusive and too controlling. (To be sure, conservatives have sometimes sought voter support by promising progressive measures.)
The liberal-progressive run has left us with what you see around you, a mixed record of wise measures, such as Social Security and Civil Rights protections, and a mess of costly entitlement programs, regulations, subsidies, and competing agencies. Like a rubber band you can only move in a progressive direction so far before something snaps.
So, the change you see on the conservative side is NOT greater conservatism, but conservatism approaching the end of its tolerance level. On the liberal side today, you see the habitual striving for more progressiveness, but a dearth of good ideas to sustain it.
Nothing has changed in terms of the basic dynamics of politics today, and everything in terms of the tension between the two ends of the counterweight. Things are going the conservative way and when it dominates, it will bring changes and consolidations (not wholesale undoings) that will eventually reach a point of diminishing returns, at which point the liberal side will have been pushed to the end of its tolerance level, and once again we'll swing the liberal direction. It's all good.