Yes, but the attachment styles are almost faulty now. Look at the millenials - they have been over parented and many suggest that they are ill-equipped for an independent lifestyle. But this is about parenting, rather than whether or not having a family impacts your ability to be 'successful' or provide innovations through your work.
I do think that economic changes (especially when you consider the cost of higher education, and the debt students have) impact what people want out of a relationship, but it's a major factor in whether or not people can even have relationships. As someone in their 30s with debt from higher education, my only option is to continue on through to graduate and hopefully gain a decent income post-graduation. However, that decent income will require a lot of hard work and sacrifice. I might want a family, but I don't have a choice to have a family if I want to be able to provide for them. This then leads into the higher incidents of crises - we're overworked, underpaid, and stressed out.
I think the choice to have a family now is much more complicated than a few generations ago- especially because of the economics.
Well I think that all decisions are going to dictated by internal and external pressures, in reality its always a combination of the two at work at any time, although I'm inclined, personally, to think that its often more the internal pressures which trumph the external ones, social psychology (and I think all psychology is social really) rather than sociology.
If someone has a secure attachment style, then they are more likely to engage in that sort of moral or psychological calculation and decision making about making or breaking relationships as a consequence of economics.
Over parenting may result in insecure attachment styles but I'm not sure whether that's possible, over parenting would at least involve attention and the other sorts of interaction necessary to develop security, self-soothing, self-regulation etc. Parenting styles would be part of the social "scaffolding" that I was thinking about but I dont know that many people who consciously and deliberatively seek to engage in parenting towards are particular attachment style when they have kids. They just want to care for them and be "good enough parents" and usually that's sufficient.
Although there's a hell of a lot of distractions for parents and children which I think will screw with this process, then there's additives and drugs in the food, water etc. which there havent been years ago, all of which I'd expect to effect organic developmental processes too.
Consider the world of yester year without TV, with commercial breaks every couple minutes, without radio, with few books etc. etc. your only focus would be your relationships and your children would be a big part of that, perhaps for subsistence purposes and survival odds even. I think those are all big factors in attachment and attachment is a big part in maturation rates and speeds, let alone crisis.