One of the great things about it is the amendment process which makes it a living document. So, just like we amended the constitution to allow people to vote for their senators, if we were to do the same amendment process to allow the people to vote for their Supreme Court justices, I would applaud that as a victory for democracy, the constitution, and Americans.
I don't believe anybody is so high and mighty that they should be above the "inconvenience" of having to be elected. Supreme Court judges are human like the rest of us.
We elect our president, we elect our representatives, our senators, our governors, our mayors, etc. why should our judges not be held to the same standard?