J.R.
From my understanding -- through experience -- I have an 18 month old -- as well as talking to others and reading books (Elizabeth Pantley No Cry Sleep Solution for Toddlers and Marc Weissbluth's Good Sleep Happy Child -- or some such title but the author is correct:)) -- from ages 1-about 18 months toddlers transition from two to one naps, and may fall asleep earlier in the evening as a consequence. Mine did so at 15 months.
I also did baby-led sleeping and continue to feel for us it was the best decision, as well as baby-led weaning. He is down to 3 bfeeds a day. at some point, it is possible to consider a routine surrounding the one nap day. It makes things easier i think for family and toddler.
Hope this helps.