There are so many variables in a relationship, there's no telling what will work for yours, so I'll just tell my story.
My DH could care less about reading MMM, so I don't even try to get him to, nor do I quote MMM, ever. Blogs are not his thing. To gauge his interest, I said something like, "there's this couple that were fairly frugal and saved a lot of their money and now they're retired". He gave me an 'meh' type response. So I tried another tactic and when he was complaining about his work, I called it F-U money, and wouldn't that be nice to have. Ding! Ding! He resonated with that. Okay, so now I had some common ground and we could form some goals about how much F-U money we would need and how best to get there - and what was worth giving up (eating out) and what wasn't (his hobby $$ and waterskiing).
There's a lot we could do financially to be truly badass, but DH isn't there, and probably never will be, so I do the best with what I have and keep chipping away with subtle conversations. He's really good at fixing things, building from scratch, created me a huge veggie garden, doesn't buy electronic gadgets, so I take the positives and keep moving forward. Could we get there a lot faster if we did all the MMM badass things? Absolutely! Does it make me a little pissed off that I have to wait? Absolutely! But I do my part in being badass and I'm patient on his part, and redirect, but never nag. I haven't nagged for 20+ years and I'm not going to start now!
If your wife is a bit of retail-therapy type person, you need to redirect her. For example, I use to shop at Target because they have good prices on food, but DH would always put extra stuff in the basket. Then I started to shop without him, but I was still putting extra stuff in the basket - they have such tempting stuff! So, I just shop my local grocery store which has no tempting items. I go to Walmart about twice a year and buy multiples of things so I just stay out of those stores most of the year. Also, make sure you're doing things together so she doesn't have time to go to the shopping mall or surf Amazon - go for a picnic, try mini-putt for the day, offer to do her pedicure - be creative. Maybe she'll see how life can be so much better than spending on 'stuff'.
Good Luck!