Transport, Communication, Finance, Info networks have all changed drastically from the past.
And the sociologists have been pointing that out for a long time now. Check out
Zygmunt Bauman's Liquid Modernity.
Beck's Normal Chaos of Love
Works of Judith Stacey
Its a complex ever changing world out there. Coevolution requires a bit of stablity in the environments. Focus should not just be on what individuals are doing for each other but on how they shape the environment around them in ways that makes such things more possible.