I've read several places something about ...

You can live:
3 minutes without air
3 hours without shelter (protection from exposure)
3 days without water
3 weeks without food
Note: actual results may vary

When you say "warmth" I think what you mean is to maintain body temperature. If in a hot region, the problem them becomes keeping cool.

If you have't already done so, I might suggest you read Cody Lundin's book "98.6 degress: The Art of Keeping Your Ass Alive".

Cody's premise is that at least in the short term (72 hours), the primary issue is keeping your body temperature stable.

I also think about exposure to things like insects, fungal/mold infections, etc...

I also would raise Signaling to a higher importance. Keeping your survival situation as short as possible could make a big difference.

And you don't mention Medical needs at all.

I would also put food near the bottom of the list. If I follow the rules (let people know my plans - where I'll be and when), then my "survival" shouldn't need to last very long. That is why, at least in general, I myself don't put food on my list of worries, even though others are often very interested in fishing, trapping and hunting skills. You may have noticed that when Doug put fishing gear in his survival kit he commented that it was as much to prevent boredom as to provide food.

It seems that ETS lists the categories in order of importance as:

Medical care (mental health included), Shelter, Signal, Fire, Water, and Food.