Is this tag really necessary? Usually we distinguish other systems from bricks, not the other way around, since the overwhelming majority of questions are about bricks, as implied by the name of the site.
Only two questions used this tag alone, I have re-tagged with other more appropriate tags and removed all references to this tag on every other question.
The word brick is not just generic for lego parts, it is also a type of part it self.
So yes, I think it should be kept incase people are asking a question regarding the type 'brick/s'.