That is not the issue at all though, you can change the constitution and still hold it in reverence, in fact it would probably be easier to have reverence for it if that was possible.

The problem is that all political constructs does become antiquated over time. It needs to be updated and modernised through amendments or even a rewrite, but the way the US political system is dictated to be makes it virtually impossible to do now. Even mundane legislation cannot be passed any longer, let alone amendments. It is a problem which should have been taken care of long ago, but now it is basically too late for even the slightest attempts at tweaking it.