Andrez - the sort of worries and debates that you've quite rightly shown us in your post(s) have certainly arisen in higher education and probably in primary and secondary education as well.

I don't think I'm actually recommending that we promote Web 2.0 technologies for their own sake - just be aware that, whether we like it or not - the youngsters are using them, probably without realising that they are doing so, and without giving them fancy names like "Web 2.0"!

As to whether it's all a dangerous thing for the mind or not - Susan Greenfield may well be spot on here - I can't see Society (with a capital S) calling a halt to it all unless you actually ban it from homes, schools, cafés, etc. Can you seriously imagine that happening on a nationwide or any-wide scale? Doubtful, somehow. So - even if you don't like it or want to embrace it wholeheartedly, be aware that it's there and it does have its uses.