You correctly point out that there are differences now between house and senate delegations (mostly due to gerrymandering), but miss the larger point that state governments have been transformed into powerless administrative provinces of the federal government, short of secession.
The 17th fails on its own merits - it's a century-old experiment, and its time to recognize it as a failure and end it before more damage is done.
It’s not a failure. By your methods, all you do is put half (or more) of the Senate seats out of permanent reach of electing Republicans. Direct elections ensure that EVERY state has a shot at doing so, including even Massachusetts (Brown’s election would never have occurred with a 90% Democrat legislature).