It's an interesting question sumo. Would you really and truly be willing to go with just a single blade to do all tasks? I wouldn't. I can't imagine having anything less on me than all of the following:
machete/small axe
medium-sized knife like RMD/511
small knife like Scrapivore (since it weighs practically nothing)
multi-tool
At the moment this is the blade load out that I have in my bag:
B-11 on pack with a Kabar 3 blade folder pocket knife that I have had for 30 years
a custom little knife that is part of a eating kit that does small jobs
Victorinox multi-tool for all kinds of stuff
generally a folder or BM42 in pocket.