10 years in and I can dig up the spark on occasion. It's still there, just not a daily, weekly, or even monthly thing - well, outside of sex I suppose, when it's more apparent, though like you that's only about once a week and I'd prefer more.
On the other hand, I'm sharing my life with someone who is unfailingly kind and generous, a wonderful partner in raising our children, always has my back, and is a source of comfort every night when he throws his arm over me and pulls me in close. Considering all that, I'd call my marriage a win.