Demand is only outstripping supply because they aren't paying sufficiently. That's the essence of the market. If they would only pay more, then demand would certainly not outstrip supply.
So the supply will increase, just of lesser developers. Additionally, I think it is possible to pay developers too much: I recall some study about how a salary beyond a certain point can actually make developers less productive. (I could very well be mistaken on this--I'm too lazy to go look right now.)
Basically, trying to hire great developers is complicated and just having more random people go into software is not the answer. Software is already one of the best paying "hacker" jobs around anyhow; you're not likely to attract true hackers based on more money.
A listed-company with a market capitalization of USD 100+ billion cannot count only on its employees' passion anymore. If it pretends like it's doing so is disingenuous.
Not that I'm saying it's a perfect market, but if prices are being artificially stifled then the theory suggests that it'll reduce the supply, as people find better things to do with their time.
If you can't differentiate between developers of different skill levels then you've already got a problem (and a broken market).