Whatever SLS is supposed to do, SpaceX will just go ahead and do on their own first.
Probably.
Much cheaper for NASA to pay for space exploration or whatever in space as a service from SpaceX instead of buying their own hardware from Boeing. Even considering sunk cost.
The SLS is supposed to produce 8.8 million pounds of thrust, a little more than the 7.5 million pounds from the Saturn 5.
But the SpaceX Falcon Super Heavy is supposed to produce about 16 million pounds of thrust.
Why are we still fooling with the SLS?