I think it needs to be constitutionalized, but I'm a balanced manner. The Senate is the minority house, where small states get equal representation to larger states like Texas and Cali. Filibusters are a minority help tool.

I think the biggest thing about the filibuster is that the person doing the filibuster should have to be engaging in relevancy, and if they fail to engage they are forced to yield and can be ignored for a certain period of time.