The CalGuns Foundation has calculated that the number of carry licenses in California could reach as high as 1.4 million if the Peruta decision stands and California goes "shall issue".
Following the Ninth Circuit decision holding "good cause" requirements unconstitutional, The Calguns Foundation projects that the number of California carry licensees will skyrocket during the first year of effective "shall-issue" licensing.They have calculated the growth of carry licenses on a county-by-county basis which can be seen here. Their table provides estimates for a range from one to five percent of a county's population with the expectation that two percent will be the most likely. CalGuns has used available census statistics, California Department of Justice statistics on both carry licenses and firearms purchases, and the experience of other states to make this projections.
According to data sent to The Calguns Foundation by the California Department of Justice, the number of California CCW licensees in 2013 totaled about 56,000. However, in applying projections to state and county population figures from the state's Department of Finance, Calguns believes that the number of licensees in California might reach as high as 1.4 million in the Golden State during the first year of a "shall issue" system.
Looking this over, it is is interesting to look at the table to see what might transpire in some of the more anti-gun counties. For instance, San Franciso County might grow from two carry permits to an estimated 12,707 at the 2% level. While San Francisco is the most extreme example, many other counties could see multiple 1,000% increases such as LA which could see an 88,000% increase in carry permits at the 2% level.
You have to wonder if the state's anti-gun politicians might moderate their extremism if they suddenly found a good number of their constituents had carry licenses. It is easy to demonize a group of people when you only have a few examples like the two who have carry licenses in San Francisco County. It is much harder to do if you have substantial numbers and everyone knows someone with a carry license.