A lot of folks that are not knifeknuts, often get by with one or two knives. My Grandfather used a small trapper (or was it a stockman?) for just about everything for 50 years before retiring it in favor of a SAK, owing to it's blades being nearly sharpened away.
If I had to, I quess I could get by with just my Spderco Moran drop point, a multitool (Wave or Swisstool), and perhaps a folder (probably my Spderco Calypso Jr. LW); but hey, what fun would that be, when there are so many other interesting knives to own?