Any time a business is saying they are having trouble hiring someone talented... maybe they just have to look inward and improve their own training processes.
Granted, there's going to be related costs of sifting through many unqualified applicants; but that's part of the cost of doing business.
Finally, I explained above why businesses don't want to train employees. It really is that simple. Th e math is basic and as inescapable as gravity. (note that planes do fly, aka, you can defy it by devising a clever contraption).
If 100% of the companies decide it is not worth it to train employees because it's easier to hire already trained employees... there would be no trained employees to hire.
So it's like a market force - as long as some companies are paying to train employees, other companies can take advantage and hire externally. But not all companies can do that.