to nap or not to nap?

We are reaching that point with the little guy where napping suddenly seems optional in his mind...not in his mama's mind yet! He's almost 3 (in February) and I was able to hold out on the nap with my daughter until she turned 4.  Wondering if I'll be able to hold out that long with him. Right now he will nap great (2 hours plus) about 4 or 5 days a week, and not sleep at all the other days.  Why is it so important? For one, he still needs it.  Otherwise evenings become a mess of fussing and tiredness (and that's just me...oh wait. him too!).  For two, mama needs those moments of peace, to regroup and be ready for the evening ahead--for daughter coming home from school, homework time, dinner preparation and evening with all four of us together.  Praying this boy gets back into the rhythm of his nap soon!