I met up with one of my schoolfriends for lunch today. Was great to see her and catch up. She is on my side and feels W is over-reacting (but then she doesn't have any problems with porn at all).
I've avoided talking about the porn issue because I don't really know how deep you went down the rabbit hole. Obviously if it's affecting your work and your relationships then clearly that's an issue, and only you really know that. But just in general almost every man watches porn (there's an old joke- 99% of men watch porn and the other 1% lie about it), and I would venture to say that everyone that wants to throw you under the bus for it has watched it themselves.
Whether you're religious or not there's a significant quote attributed to Jesus- "First, remove the beam out of your own eye, and then you can see clearly to remove the speck out of your brother's eye." So your wife wants to wreck her life and yours over you watching porn, but is her life so squeaky clean? Or is she trying to remove a splinter from your eye while having a log wedged in her own? I doubt she's perfect.
I'm not giving you a free pass for the porn addiction, but I am agreeing with you that this should not be a deal-breaker in a relationship. If your W thinks she is going to leave you and go out there and find a perfect man who never watches porn then may God bless her poor, ignorant soul, LOL!