Completely agree that the system allows for more successful goalies. There's a reason Harding, Kuemper, and Bryz were all top-20 goalies in the league.
Still, you need a goalie who can perform. Kuemper has great size and strong athleticism. It's way too early to say definitively what he is, but I would take my chances with him.
If Backstrom wasn't under contract, would anyone be complaining about giving Kuemper $3m per year? Look at how much these goalies make:
Lundqvist = 8.5
Rinne = 7
Rask = 7
Price = 6.5
Ward = 6.3
Crawford = 6
Miller = 6
Take Backs out of the equation and you'd be looking at a combined $5m or so for Kuemper and Harding. How is that an issue? Or take out Hards, and you have $6.5m. The tandem is making less than a big chunk of starters in the league.
Kuemper has done everything he's been asked to do so far. You can't ask a kid who hasn't made any money to take a discount because of mismanagement of the roster.