Who would perform the function of determining whether legislation is constitutional?
Who determines it in the first instance (and often the final instance) now?
More to the point, what is the record of the courts in enforcing the Constitution? The document's clearest commands pertain to its structural features, and all of them have been gutted.To what exactly are you referring?
So you would look to the legislatures - who change membership every two years - for consistent principles instead?
I don't think the aim is for it to be democratic. The courts were put in place to check democracy, not to purify it.