Jeff I am glad you are being realistic. I do think the letter was perhaps more for you than her. Well in the sense of saving the marriage-yes that is the goal, a goal at least but you needed to get out of the limboland you placed yourself in to some degree. This is were DBing sometimes lets us down.
Yet we are encouraged to GAL, move ahead but sometimes we concentrate on the DBing to the extent we loose ourselves. Maybe its a pride thing but the letter has done you good and it shows.
Whether or not your wife gets over her hang ups remains to be seen. I am on the fence on this one but I do know you will be fine whatever.
It has as you said got you/ her unstuck thats a positive.