We currently don’t have an auto-evo algorithm (the part for population dynamics is missing) complete. Here’s the latest thread where @NickTheNick worked on it: Nick's Auto-Evo Algorithm (Episode 1) (but it wasn’t finished).
With proper auto-evo the species population changes would be derived from how well they are adapted to their environment and how well they can compete against other species.
So with the auto-evo done, we would be most of the way there already.
A stop-gap suggestion was done here: Population Scaling before we get auto-evo done.
These your suggestions seem to me to be long-term effects, which is a topic that has been discussed quite a bit, but those are difficult to fit in the game design as the environmental changes need to happen slow enough so that the player can react to them (so they don’t fit the timeline of a single editor session representing 100 million years).
So while we could add some of these now to make things less static, these would need to be majorly reworked once we get proper auto-evo. As such I don’t think these should be added to the game at this time.