P.M.
I'm big on attachment (co-slept my daughter for nearly 3 years and never regretted it), and breast milk is awfully good for children for as long as you can provide it (you'll know when it's time to stop), and teething could become an even bigger issue for your son if you were to withhold nursing when he wakes at night, so I'd say that as long as you can flow with it, go with it.
The other thing I've noted with my grandboy, and heard about from other parents, is that babies and toddlers get whims that can quite suddenly change their preferences. The technical term for this is "stages." It's possible that starting tonight, your sweet, silly son will suddenly decide that ONLY daddy can put him down at night. Then he could switch again in a few weeks. (I think they do this because life needs regular doses of the unexpected and puzzling.)
If you'd like to encourage a shift, you and Papa might both put him to bed together for several nights. Sometimes small shifts eventually reach a tipping point, and voila!, suddenly new preferences take hold.