Boeing does indeed seem to be in deep trouble. For instance, read
https://www.yahoo.com/tech/boeing-strike-existential-threat-boeing-163755467.html .
And Artemis seems to be in other trouble, too. Not just the Orion capsule heat shield, but the whole schedule seems to depend on a lot of commercial companies needing to provide key equipment that has not even been designed, yet, much less tested at this time.
But, I am going to disagree with the posters above who think we should be skipping the Moon and heading directly for Mars.
We need experience with a continuously crewed habitat on the Moon before we are ready to try for something similar on Mars. And, there are plenty of reasons to want to use the Moon for scientific purposes, including both the geology of the Moon to learn more about the history of our own planet and planetary system, and for large, serviceable, upgradable telescopes that the Moon can shield from all of the interference we emit on Earth.
SpaceX seems like the obvious choice to support NASA's goals on the Moon. With some backup from other companies, such as Blue Origin, NASA could probably do away with the SLS and work with SpaceX to develop most of what is needed to get to the Moon and support a habitat there. And, SpaceX would probably appreciate the associated funding to do most of what it is planning to do anyway without NASA.
The way things are going now, I don't think NASA has much choice, other than failure. The funding by Congress is just not sufficient to finish the development of SLS and provide enough launches. But, if SuperHeavy and StarShip soon achieve their design capabilities, they would offer NASA a transportation option that it could actually afford.