Sorry to ruin all yinz Daniel Boone fantasies but in a SHTF scenario deer would be practically extinct within a couple months at most unless you can defend your supply in a geographic area. My dumbass city friends are always like "if the world ends, we're coming to live with you and live off the land" and I'm like first of all, I don't get down with the prepper dweebs because nothing like that is ever happening, but secondly, if it does, it's going to be all out tribal warfare within weeks and you better bring something more to the table than flattery.
Eating game meat only as a matter of lifestyle I would need to kill a few more does a year and probably buy another freezer but not much would need to change as far as tactics or time commitment unless it was for the sake of increasing efficiency alone.