Even without the oil crisis the golden postwar era economic boom was coming to an end, the US went off the dollar in 1971 and inflation was on the rise from the late 60s. The business slowdown of 1970 had already thinned the fields in the Can Am racing series. Without the oil crisis the 70s won't be as bad, but the bugs in the postwar system were now making that system unworkable.
I'm no expert on nuclear around the world, I just know a bit about Australia and the UK. It appears as if by the 70s the first great enthusiastic rush to nuclear had died down and countries were living with the reality of nuclear power. In 1971 Australia's nuclear power reactor projects was cancelled just as construction began in favour of coal. In the mid-late 60s the British 2nd generation nuclear power plants had dubious business cases resulting in an effective push-back from the coal industry, and the costs ballooned for these plants. In parallel things like the NPT, ABM Treaty, SALT I & II were occurring. The 3 mile Island occurred and all these factors took the steam out of nuclear power for decades.
