I have kept the number of cartridge types to a minimum (.22lr, 9mm, 5.56, 3.08) and have some single-digit thousand rounds total across all of them. At the rate I go out to the range, that will last me for quite some time, and well before I run low, the world will have changed many times and, in the case of ammo availability, likely for the better.
Yes, there may be higher taxes
There may be wind-down of specific cartridge-types if there is a ban on some gun designs
There may be long-term hoarding as there is now (though I doubt it - the attention span of most americans is far too short)
So just be patient. Unless you are absolutely dry or have some emergency need, 'this too shall pass'.
B