Sounds pretty normal, but if baby can go about 3 hours between feedings at some times, and only 1-2 hours at others, and mom is the sole provider of food, I suggest having dad get up and try to soothe babe back to sleep if it hasn't yet been 3 hours. The fact that baby is up and not wanting to eat a ton might mean that he isn't up because he's hungry, he's up because he just needs a hug or other comfort.
Up every hour to nurse just a little bit could mean mom is getting into human pacifier territory. I definitely was that to some degree with my second DD, but I was working full time and she was reverse cycling- consuming small amounts of pumped milk during the day, bottle fed by DH, and making up for it at night. This was tolerable because her crib was right next to our bed, and I barely had to be awake to pick her up, lay her down next to me, and nurse why laying on my side and practically sleeping through it. I'd wake up in the morning and think "hey, I don't remember moving you!" But obviously I did. Cosleeping can be dangerous, so tread lightly and only if you know your sleep habits. If you or your wife flail around and might flop over on your baby, don't do it. I would pretty much sleep in a frozen position on my side, available as an all night buffet for my baby. It met both of our needs just fine. I was worried about her transitioning to not doing this, but it was a non-issue. We just put DH on duty after she moved out of our room at a little over a year. She knew Dad isn't food, just hugs. She cried a bit the first couple nights, but it wasn't like she was being ignored or alone. DH was there to soothe her and put her back down.
I do not suggest moving to formula if he is exclusively breastfed at this time and your wife wishes to keep it that way. Supply is based on demand, and if he is full of formula, this could mess with her supply. But if doesn't matter to you, that's okay, too. I just was personally very dedicated to nursing and it was super important to me... but you guys may think I'm crazy because my kids nursed (of course less frequently as they aged) up to 2 years and 364 days. I even tandem nursed for 6 months; they are 2.5 years apart.
Good luck!