There is none; nor will there ever be one. There are enough CFIs, pipeline patrol, survey, skydiving and part 135 pilots in the hiring pool right now to fill every single slot at the regionals. This shortage issue is only a "shortage" of pilot applicants who have never busted a checkride or gotten a DUI charge on their record. Beyond that, there are more than enough pilot applicants for the regionals to hire. Which is exactly why the pay has not risen in the slightest. Why should it when there are so many pilots still applying?