This is not a shortage of people, it's an unwillingness or inability to raise salaries to the point where your group is attracting the people it wants.
I appreciate that the ability to pay people enough to attract them is a problem that is very difficult for institutions and organizations to solve, but living on a sub-standard salary with no job security and few career prospects (how many tenure-track opportunities are expected to open up in the next five years for the people who would fill those positions?) is a difficult problem for highly skilled post-doctoral candidates to solve, too.
I appreciate that the ability to pay people enough to attract them is a problem that is very difficult for institutions and organizations to solve, but living on a sub-standard salary with no job security and few career prospects (how many tenure-track opportunities are expected to open up in the next five years for the people who would fill those positions?) is a difficult problem for highly skilled post-doctoral candidates to solve, too.