^ Excellent post. That sounds similar to the "reach for the best feeling you have" idea from Abraham-Hicks. Our beliefs are very malleable.
Another reason why you might want to consider conscious belief replacement is by considering where most of your beliefs are coming from. You see, we live in an age, and inside that age, everything looks normal to us, without its proper contrast. However, if you step outside that age and start exploring history, you start to find and realize that other people held greatly and vastly different views on everything. We are, in many ways, the products of our age which forms our environment. If you've ever taken sociology or social psychology, you'll realize the extent to which "independant" people are influenced by each other and our surroundings.
Of course, when I speak of our surroundings, I include other people. How many beliefs do you hold from childhood which you just accepted because they were imposed on you before you had any sort of analytic or critical thinking faculty? You might choose to change any of them, but you should analyse them to make sure everything is good. For example, my parents tried to indoctrinate me with the idea that other people don't care and that only my family cares. Which is fine, its their belief formed after being burned by other people so many times (its still an example of a cognitive bias--probably over-influence by vivid emotional evidence), its just a very limiting belief so I never accepted it, consciously. However subconsciously, it was still affecting me so I had to work through it. I'm not saying that people consciously put self-limiting beliefs into your head, but they do do what they thing is best. So that's one reason I believe one should consciously evaluate and then maybe choose to change your beliefs.
Another way that we form beliefs is through our own experiences. However, there are many cognitive biases which affect us, including the
Fundamental attribution error - Wikipedia, the free encyclopedia. That one affects us because of our misunderstanding of how much other people around us and the environment around us affect us.
Here's the wiki page on them
Cognitive bias - Wikipedia, the free encyclopedia and a list of them here:
List of cognitive biases - Wikipedia, the free encyclopedia.
Another reason you might want to change your beliefs is what I said earlier about experimenting with finding other, more empowering or accurate beliefs.