Total apocalypse isn't the answer, and we haven't yet reached the population limit of our planet yet. Back in the middle ages killing some people off made room, and made it easier for the survivors to live, ushering in an age where individual artisans could appear and invent. but it wasn't ALL who died in the black death, it wasn't even 80-90%, it was only around half. So if that's your goal you have to find a sweet spot of 30-60% of the population killed. And you also have to leave food stores, and production etc. basically untouched, and ensure that enough of the wealthy are killed off as well (the black death killed off some of the early power-brokers which made way for new ideas to flourish without getting crushed by an establishment).
But I'm not sure that sort of thing is productive in our time, sure there are people who are just acting as a drain on our society, but killing them off would just give us a further surplus in supply.
If you think about it that's not what America is missing, one of my friends who grew up in the UAE told me that the primary difference between the US and the UAE is that there are just some things you CANT get there no matter how rich they are-whereas in America you can get virtually ANYthing if you have the cash.
So our problem isn't really supply, its really the establishment power mongers that are holding us back. The oil companies stop us from getting new clean energy technology, the power companies in bed with big oil hold us back from getting solar or more nuclear, the religious establishment holds us back from the correct social change(allowing gays to marry, providing equal rights and choices for women) etc etc... I could go on and on but you get the picture. What we need is an apocalypse that targets the powerful elites who are holding us back.