We now have two sons away at university, and the third goes this autumn, and it was noticeable when we started looking at accomodation for ds1, that the vast majority of student accomodation now has en suite bathrooms for every room. As a student nurse, and later as a university student, I shared bathrooms with the other people on my corridor - an en suite was considered the height of luxury.
Admittedly, the en suites in their student accomodation tend to be pretty basic - there seems to be a prefab plastic pod that is just put in - with shower and loo and basin - it is definitely hose-clean architecture, with no frills!
I still think it is a bit of a luxury - though it is one I would not want to give up myself (the comfort of being able to nip to the bathroom in the nude, and the sheer delight of not having to share a bathroom with scuzzy teenage boys, and of not having to queue for a shower in the morning), but I don't want the dses to think they have a right to an en suite.
I do agree with the OP, though, that I wouldn't want an en suite if it was going to be a tiny, poky, damp cupboard or if it was going to make my bedroom layout less practical and flexible.