Important factor is how many of the "qualified" candidates clear the interviews?
The problem is not the lack of people to interview, it's the lack of people who clear interviews.
Actually, my problem in this (non-Bay area) region of the country where I now live is that I don't have a ten-year Java history, and most managers here don't seem to believe that my background in C, Python, Lua, and JavaScript would allow me to pick it up in a very short period of time (and indeed, I've since picked it up for Android development, and it turned out that the Android API was harder for me to learn that Java itself).
I can't say I disagree with that statement in and of itself. Yet I believe you are getting few qualified candidates because companies are asking for highly skilled people with a great deal of experience and then only, and my opinion is intentionally, offering well below market wages. This then allows them to scream "there are not enough developers". The whole shtick is just meant to repress wages..