Mental healthcare is a complex mix of science and art. It requires a basic understanding to practice competently, even under supervision. Frankly, as a QMHP myself working on a Master's Degree, the requirements for QMHPs are already very low. There are many degrees that are accepted as "related" degrees, and with enough hours of experience any college degree meets this requirement.
I think we should be moving in the other direction. I agree with having related degrees count, but I have concerns that unrelated degrees allow entry into this field. I think we should at least require certain classes like Abnormal Psychology and some kind of undergrad Psychology research class within the context of a Bachelor's degree.
I'm not saying that nobody with a GED or high school diploma can be helpful, but there are just certain things you learn with a Bachelor's degree with classes in related fields that you need in order to understand the issues people are dealing with when you work with them.