I don't understand how wilderness odds works. I just went through 7 lives going through wildernesses without getting anything. In maybe 15 lives total in the wilderness, counting what I had previously, I got a single wilderness upgrade.
It said something about happening in the first few years in any given wilderness, so on some of those lives I only spent like 10 years in any one and went in 10 different wildernesses, still getting nothing at all.
It is possible I'm astoundingly unlucky, as has actually been the case for me in multiple other games, including getting astronomically poor rolls at one point in fallen london (failed an 84% chance 24 times in a row, something like 1 in 12.4 quadrillions odds)
EDIT: Finally got one, odds for me seem like 1/10 lives rather than 1/4. Now I wonder if there is any way to keep track of em.