I've worked for both the private and public sector and found folks in both that are just skating by, essentially buffered from advancing themselves by the infrastructure and bureaucracy or the corporate culture. I've had bosses that weren't all that interested in learning anything new and as a result tended to not expect much growth out of their employees. In that sort of environment it is essential that the expectations are kept low by all involved lest someone get the idea in his head that more could be done or that new technologies could improve things. One project I worked on briefly was specifically handled like this and wanting to do something different was akin to heresy. Pretty pathetic, really.
At my shop, everyone is expected to stay up on current technologies to some degree and we each have our areas of particular interest and expertise. The culture is one where we don't rule out new ideas and will invest some time in learning and prototyping solutions using newer technologies to see what sort of benefit we can gain by doing so. If you are in a competitive environment like we are, you end up sinking your own ship if you rest on your laurels. My personal goal is to be considerably better than the guy in the next office and I believe that is a common goal among our employees. Corporately, our goal is to provide better solutions than the 'competition'. You can't do that, typically, if you don't keep up with the changing world around you. Doesn't mean that you go into 'magpie mode' and chase every 'shiny' technology that shows up on the radar, but it does mean that you spend some time making wise technical investments.
Personally, I don't want to ever hire or work with anyone who is satisfied to be mediocre. I have to deal with enough folks like that in life. I certainly don't want to depend on them personally or have my company depending on them.
So it is a corporate culture thing and it is an expectations thing, really. If you set the bar low, you'll get low-jumpers. To be the best, you've got to invest, right?
Just my two cents.