Bad idea.
The Massachusetts legislature has bad breath. I do not want them choosing Massachusetts senators.
Of course, admittedly, Masshole voters do little better.
Oh, and Mark's amendment allows for state recall of senators who get stupid and forget for whom they work.
The 17th amendment was no small tweak to our constitution. It fundamentally screwed up the careful system of our framers.
Booting the states from the senate not only allowed, but our framers KNEW it would result in consolidated, oppressive government.