It seems most astronomy theoreticians will rather not rock the boat, they will rather keep believing in invisible stuff permeating space everywhere with variable but exactly right density so it is consistent with star motions and images observed. I guess it's because stuff with infinity of degrees of freedom is traditionally much more secure paradigm to base a career on than to question the established beliefs in applicability of Newtonian mechanics/General relativity.
> "The only theory that has withstood the last several decades of experimental observation and simulation"
Which competing theories were put to stand the test of observation? What made them not stand well in light of observations?
> "It's the only thing that explains all the evidence"
There is little example to such a thing as scientific theory explaining all the evidence. But even if dark matter paradigm did do such a feat, it would not be a good sign for the truthfulness of it. Theories that explain everything are suspicious - they may be exercises in fitting and may not be so scientific or useful as competing theories that explain less, but better.