Re: Wife doesn't want to kiss anymore.
The fact that you used to make out all the time but now she finds it 'yucky' make me think it's technique-based. Not to knock you, but I've been with guys who claim they're good kissers and their technique hasn't worked for me at all. I don't know if I can provide much help, but I am a woman and I do love to kiss, so if I list some pointers, you can pick and choose which might apply and ignore the ones you've already tried and the ones that aren't applicable.
Do you know how she prefers to be kissed? I know I prefer kissing without tongue for the most part, except for a little tongue-action here and there, and more and more tongue as we get more horny. A guy who lunges in with his tongue all the time can get really repellent really quickly.
Do you kiss wet or dry? When you peck her on the cheek, does she immediately wipe it away? If so, you could be going in too wet.
It also sounds like she hasn't associated kissing with sex, if she thinks that now she is 'allowed' to have sex, the kissing can stop. I think that if you discuss it and tell her you're open to kissing whatever way she prefers, even if it is a few short pecks or butterfly kisses, as long as you can do them as part of foreplay/sex because you really need that connection.