A few years ago, I looked at trends in US public opinion on seven major social issues and came to the conclusion that, with the exception of same-sex marriage, traditionalists are doing a decent job of holding the line (see Dan's comments for a more finely grained, contemporary discussion of as much). Levels of support for abortion, capital punishment, affirmative action, wealth redistribution, and permitting prayer in public schools are at the same levels today that they were forty years ago (the seventh issue, support for marijuana legalization, has crept up slightly but remains a minority position).
Here's another pervious point in the traditionalist's perimeter, however. The following graph shows the percentages of respondents over time who said that sexual relations between two people prior to marriage are either "always wrong" or "almost always wrong" (the other two options were "sometimes wrong" and "not wrong at all"):
The mean liberal position of a generation ago has become the mean mainstream position of today. The mean mainstream position of a generation ago has become the mean conservative position of today. When the ratchet turns, it turns to the left.
The treatment in popular culture of the idea that a couple should refrain from having sex until they've tied the knot as something quaint, prude, anachronistic, and, most importantly, unserious, demonstrates how the Establishment is comprised primarily of progressive standard-bearers. Not that I can legitimately distance myself from said treatment--while I'm sympathetic and theoretically supportive of the idea that premarital sex is civilizationally destructive, my behavior doesn't adhere abide by it, nor do the behaviors of just about everyone I know.
According to one of Jayman's hypotheses (and the guy seems to be generating an intriguing new one every week), it's plausible to think that not only will traditionalists hold the line, but that in the future, aided by a conservative advantage in fecundity, they will stage a counter offensive and push progressive positions on these issues back from whence they came.
Maybe. While the seven issues mentioned above are reasonably representative, they are of course not exhaustive, as the persistent shift towards moral acceptance of premarital sex illustrates. It gets at the question of how substantive the Jayman hypothesis will be if it plays out as predicted. If self-identified conservatives increase as a proportion of the total population but the positions they hold morph into those their parents' generation opposed, are traditionalists on the receiving end of little more than empty semantic success, of a Pyrrhic victory?
GSS variables used: PREMARSX(1-2)(3-4), YEAR, POLVIEWS(1-3)(4)(5-7)