I’ve discussed this on another forum based here in the UK rather than USA. Yes Dick Proenneke did it, but we were under no illusions that that would be tough. The USA has more true “wilderness” areas than the UK and you guys can bow hunt. However the 1 thing that became apparent for all countries is that we had considered from posters points of view is that a homestead (Amish style) would be the most acheiveable, and sustainable.
A true mountainman style existence is do-able, but only for a short period of time. Before long you are back to the Amish style existence albeit on a smaller scale if your only providing for 1 or 2 people.
Personally, the smallholder / Amish existence is more appealing to me, its still governed by the seasons, but would allow you to have a small sideline of income to pay for stuff you cannot make yourself reliably (broadheads and arrows etc cost money).
I have seen Dick Proenneke’s program but I know its not for me, it would be very hard work and I do take my hat off to him. Please remember though, he was having staple supplies flown into him though.