I have never traveled light in my life. As I see it, you would not go golfing with only one or two clubs, so why limit yourself here?
You bring up a fair arguement, and I agree completely with the analogy of golf clubs all having their different uses. The part we have to keep in mind that we only carry golf clubs for a few hours or we put them on the cart. Post SHTF it's going to be a different situation and I doubt that we're going to have a cart. I really don't like the whole "1-gun" idea myself because I view mine as golf clubs capable of different tasks and responsibilities.
I see two different possibilites post SHTF:
Option A: Choas, looting, and life with out the consequence of a rule of law. I see this as more of a first phase of our upcoming economic collapse, but it's where the AK/AR & a long range rig is going to be worth it's weight in gold.
Option B: Period of time when people will have settled down and life will be focused on more of a survivability with trading and bartering. This is more of what I consider to be the second phase and it's where I see the arguements for the 10-22's for small game with an abundance of ammo in a stockpile.
The best compromise between the two different needs in my opinion is the AR with a 22lr conversion kit. I was slow to come around to the 22lr conversion kits, but I'm glad that I did.