I find myself with this attitude sometimes as well. Though, I think it's only tangentially related to consumerism. People live such busy lives, dual income FT, maybe with kids or a social life on top of it. It often just "feels" like there will never be time if it doesn't get done... now. Of course, people wouldn't need to work so much if consumption were reduced, hence the relationship. Obviously the "just get it done" attitude is more expensive, and generally much less enjoyable. Hence adding to the cycle of work more to earn more, then needing to vacate more from life because what could have been and enjoyable project ends up a rush-rush-rush, get it done while we have time, hassle.
Interestingly, I think the OP idea of shit getting old and dysfunctional is simply the other side of this same coin, at least to a degree. Instead of rushing out to purchase a quick fix, since we lack time, people just "live with" what we have because it's less time consuming than finding a better solution. This version has some advantages, the main one being less consumption. OTOH, with free time better solutions could probably be created with very minimal consumption added with bit of value creation (ie refurbish classics, DIY solutions, etc).
This is not to say having additional time will automagically fix the problem. I think most have been acculturated to this for so long that it takes concerted effort to get out of this mindset.