Where will you get the piece of glass?
And yet people have been successfully building shelters, making traps, skinning and cleaning their game and fish, collecting firewood, etc., etc. for over a century with
nothing but a sub four inch blade Mora, possibly paired with a SAK or jack knife.
The fur traders (AKA "Mountain Man") generally had two knives with them while out trapping. The first was their patch knife. It was used to cut patches when they loaded their muzzleloader. (The cloth around the ball was called a "patch". It was what engaged the rifling of the barrel, not the lead ball.)
Their second (primary) knife would be a 4 to 7 inch knife we would consider a "butcher" knife today. Wood handle slabs riveted to the tang, no guard, etc.
They did not depend on a knife, a cutting tool, that they trusted their life on, to chop or split wood. A hatchet, or tomahawk was always part of their kit. Some might have had an axe at their base camp, but they always had a hatchet or tomahawk with them, just like their knives, a cooking tin, along with powder and ball for their rifle.
I have done many "primitive camps" over the last 55 odd years. Not once did I ever have to use my knife to chop or split wood.
I have always had the proper tool for the job. A hatchet or tomahawk for chopping and splitting, if necessary. A sharp multi-blade pocket knife for things like making feather sticks, tent stakes, cleaning the day's catch, and so on, and a 4 to 5 inch thin stock fixed blade (like a Mora No. 1 or No. 2) to clean game and cooking uses.
Of course the Mora is just as capable as the pocket knife for making feather sticks, and the other things I use the pocket knife for.
If you doubt me, read the works by Nessmuk, Kephart, and E.H. Kreps.
(Admittedly, Mr. Kreps prefers the axe. In fact, the first three chapters give instructions on building and furnishing a log cabin using only the axe. He does not get into knives very much, and does not mention what style or pattern folding knife (if any) that he used.)
I admit I consider batoning a knife to be unwise. The fact of the matter is, regardless of the knife used to baton with, it will eventually break. It might take decades, or it might be the first time you baton with it, or at any time in between.
What good is a broken knife? Why take a chance?
I can carve a 6x6 post in half with any of my knives, if I had to. (Fortunately, I don't have to) It may take a while, but it can be done. There are better tools for that job though: an axe, hatchet, tomahawk, or saw.
As others have said in this thread, "The one knife for everything in the woods is a myth."
Use the proper tool for the job.
You would not use your knife to dig a latrine pit, if you had a choice in the matter, would you? Of course not. You would (at the very least) want to use an Army Surplus folding shovel, or worst case, a trowel.
The OP's situation is intentionally going into the boonies "for a long time."
Therefore, it is logical to think he would also take along the proper tools for chopping, digging, etc., a tent for shelter, and possibly a firearm or archery equipment for hunting, and a compact fishing rod and reel, as well.
As for an unexpected survival situation, you are going to use what you have with you. Period. End of discussion.
If, for example, you are out cross country skiing and get caught in a blizzard, are injured, or lost, or for any other reason are unable to continue, chances are you will not have your "do everything" chopper blade with you. At best you might have a folding knife in your pocket.
You should therefore know how to make an emergency shelter (or improve cover under a pine tree or willow, or other low branched tree) and start a fire with what you normally carry, and know how to start and keep a fire without it burning the forest down during the night.