I think fewer fish but bigger average size points to less natural recruitment through spawning (possibly because people are killing spawning age fish). I agree we need more enforcement but with the budgets given to Alberta Fish and Wildlife, more officers are highly unlikely. Rotating closures of tribs, sections, or whole streams might be easier to enforce (I don't want it anymore than anyone else).
C&R regs on all streams is the way to go but it will take a long time to get everyone who uses the rescource on board. Lots of people feel it's their right to take a fish or two home for the table, just like some people think that if they don't want to wear a seatbelt it's their right. The change in attitudes will take time but hopefully people will eventually understand that with the ammount of people fishing and the ammount of back country now accessible to them, they'll have to get their trout at Safeway if they want to continue to enjoy the rescource.
If we can keep the next generation of fishermen involved and caring about the state of our rivers maybe I'll be able to tell my grandkids how BAD the fishing was when I was young (opposite of what my grandfather tells me now).