It sorta is already like that, if you stick to the the same system (ex: french/english catholic/public) you tend to just be the same crowd following each other through school. You might switch school buildings once in a while but it's becoming more common to combine middle and high school in the same building. Either way you are all in the same "system" unless you decide yourself to switch. I switched from French Catholic to French Public myself when I hit high school so I had to make new friends but before that it was all the same people more or less.
Over time the curriculum is also updated so someone in high school now is probably not learning the same as when I was in high school. Though THAT is something that perhaps could use more work, as I don't know how often it really is updated, don't think it is updated as often as it should. For example with the lack of job security now days and the idea of being able to land a job you keep for life is a thing of the past, I think schools need to concentrate on teaching how to run your own business, rather than how to apply for a job. Do both, but concentrate on how to run a business. Graduates should come out ready to start a business, or heck, already have a business started, by the time they graduate. I think that is the future, more small business owners, as the idea of working for a big company is going to be a thing of the past, as companies are always looking at ways to cut jobs.
Schools do need to evolve more with the world trends.