I think that some of the darker, more revolutionary elements of youth culture might be blunted for a while. The Weather Underground might be marginalized within the larger movement. In turn, this could lead to less introspective and cynical songs as the 70s begin to bloom, and perhaps something akin to what we saw in the "Wacky Redhead" timeline, where television shows orient themselves more towards optimism.
However, after a few years, I can also see some disillusionment sprouting up, and a greater move towards political disaffection, which could give birth to some sort of punk rock a few years earlier, as well as shows and films that don't bother addressing politics at all except obliquely.