People have been joking lately about productivity suddenly increasing as a result of the Reddit blackout, but honestly? That loss of information is probably going to result in a loss of productivity in some cases.
Because yeah, in the nightmare scenario where both Reddit and Stack Overflow were to disappear, a lot of programmers would be at a complete loss.
I think the main solution is to have an easy way of searching for existing communities before deciding to make you own. browse.feddit.de seems to be a good step in that direction to me.