To add my point of view from the female side:
1) Yes sex for most women is mainly in the mind but not always
2) This guy seems to have done most of the right things ie talking , laying off, suggesting different approaches. His wife has to be more proactive herself and not keep pushing him away. Even if it is not pentrative sex mutual masturbation is a good place to start rather than self entertainment ( which is also great btw )
3) There is no point portioning out blame that will immediately makes the situation worse especially if one of you is sulky.
The fact that you tried two ideas ie the vibe and the porn video which worked short term could mean two things.
a) Your wife wants variety or perhaps more extreme forms of sexual pleasure than you have tried before. Have you asked her what she likes about porn ? how about making a home made one with a videocamera ! that often works a treat and is a big turn on if you play it back when sex is going a bit stale in the future
b) Or she is trying to accomodate you but didn't really like either experience much in which case you need to suggest something else.
Why not open up the lovehoney site on a browser and get her to pick a sex toy for her and one for you. For example a strapon kit is a good way to start as it can be a shared experience for you both ie the same sex experience if you both want to try anal.
Hope this helps ,tell us how you get on. Give us a few more details about how things are and I might be able to help more.