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It has terribly low stall torque. Basically it spins really fast and really efficiently, until you actually try to put any kind of load on it and make it do anything. The load slows down the disks, which disrupts the boundary layer and causes a negative feedback loop which makes it less and less efficient.

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So load it with an electrical generator and use power electronics to present a constant load. Problem solved.

Many old high efficiency engine designs were discarded because they had poor torque characteristics at the bottom end of their speed range. This is because they were coupled directly to the load through gears. That does not have to be a requirement any more.

A constant load is only useful under limited circumstances, you would need to be either constantly starting and stopping your generator or wasting energy with a dummy load for this to work.

Could you do it? Sure. Does it completely negate the advantages of the turbine? Absolutely.

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