Good post except I don't think the OP is complaining about having problems getting hired. The companies trying to hire are the ones having problems, and it seems they're doing little to fix them.
Do you think responding to email blasts would help them solve their hiring problem?
I think it's going to be slightly better than doing nothing.
What on earth? These are companies that are paying money advertising to find developers. The idea that it is too much trouble for them to evaluate or respond to emails from potential candidates is rather bizarre.