This is an interesting post, and there have been several valid points raised.
As far as reintroduction to Colorado, I don't think the government would ever let us hunt the grizzlies after reintroduction, no matter how successful and sustainable the population. If the animals started to outgrow the intended reintroduction area, the government (both federal and state) would probably have to commission a huge, worthless study that would cost thousands of taxpayer dollars. After the ridiculous study, they would probably decide that the best course of action would be to hire "professional sharpshooters" to target problem animals, again at the expense of the taxpayer. Then animal activists would fight the entire process through the legal system, costing even more taxpayer dollars. The entire time this is going on, they would be ignorning the fact that hunters could help manage the population, and pay rather handsomely to do so. It is not that I am opposed to the thought of grizzlies in Colorado, it is entirely that I do not think it would ever work out well for either the sportsman or the taxpayer. Just my $.02.
Your $.02 is worth more than you think. You pretty much forcasted with exceptional accuracy exactly what would happen if the Grizzly was reintroduced here to Colorado.