Sometimes I think that Microsoft themselves want Visio to die off. They don't give it to students (so they can learn it) and even a lot of business licences don't come with it.
I understand they want to hold something back so they can sell their super enterprise style licences, but Visio is such a versatile tool which has a wide variety of applications far outside of big businesses (e.g. room arranging, garden layouts, college classes, etc).
Worse still each year that Microsoft hold Visio back the web-based alternatives get better and better. Eventually Microsoft will just be forced to discontinue it and nobody will even notice, because almost nobody knows what Visio is or does right now.
I would happily trade Access or OneNote for Visio. Why not let me do a "pick your own licence" deal? I can pick four or five products I want (e.g. Word, Excel, Outlook, Visio, and OneNote).