That pretty much describes my current hiking setup except for a couple things.  
Added
Trekking poles - I always have them
Camera - Personal preference, but I always carry mine
Webbing - If there's a chance of doing some cross country bush-wacking or off trail, I may carry some webbing and short length of rope and a carabiner.
At least 2-4 sources of light - If night hiking it's 2 headlamps and 2 flashlights, otherwise 2 headlamps is standard.
Trekking poles?  In terms of emergency use, do you use them to construct a shelter?  And the camera?  As a signaling device using the flash?
I agree with you on the rope & biner for XC stuff.  As for lights, I've got two on my list, and I think I'll leave it at that believing it a reasonable compromise between weight and safety.
Deleted-
P38 an opener - I never carry one, because I don't carry any canned food and have never run into canned food out in the backcountry.
Two way radio - Don't normally carry them unless I'm going with other people who are carrying them.  One exception is when canyoning.
Rain Gear - If the forecast doesn't show rain, I've been leaving this at home.  I do have a homemade silnylon poncho/tarp/bivy that I may carry instead of dedicated rain gear and bivy.  Of course this varies quite a bit, usually I err on the cautious side.
Pen and paper - Never used it, so I haven't carried it for a long time. 
OK, you got me there on the P38.  

  I'm former Army, hence my bias.  People aren't using cans as much these days, so it's probably not critical.  QUESTION:  What if anything would you replace it with? 
Seems like no one likes my radio idea.  I actually had a HAM radio in mind not FRS/GRMS, but yes, it's probably not an essential.
On the pen & paper thing, I'll probably bump that down a notch, but let me tell you a note pinned to a trail junction sign might just save your life some day.
I hike pretty much the same areas, and didn't think fishing was very feasible either.  But I was wrong, there are a lot of fish up there... 
  Ah, you caught me on that one.  I was engaging in a bit of hyperbole with Rich there.  There are some good areas to fish in the backcountry in So. Cal. albeit few and far between.  What I was really driving at is that there is no fishing on 
most of hikes I go on.  My lack of fishing gear also reflects my priorities:  thermal regulation, hydration, and signaling.
However, I still don't carry any fishing gear.  I probably should, but even with regular fishing gear, I'm still not any good at catching anything.  Like anything else it's a learned skill, some people have it, I definitely don't.  
Oh, you too?  

HJ