This is what impeachment hearings in the House means

[Horse with no Name]

Regardless of CURRENT Senate support.
Paraphrasing John Dean.
Impeachment is valuable BECAUSE Bush CANNOT assert executive privilege over ANY ITEMS needed in the investigation AGAINST HIM.
All the records regarding the energy policy, the Plame leak, etc...everything loses it's cover and becomes property of the investigating body (The House). This also means that all the people that REFUSE to acknowledge the subpoenas...Rove, Rice, Miers, etc. HAVE to testify in an impeachment hearing and there is NO getting around that.
The media can ignore Congressional hearings. The media can ignore parliamentary procedure BUT the media CANNOT ignore an impeachment hearing.
SO, if you think pulling the media cover and executive privilege cover off of this administration wouldn't net the support in the Senate (because it sure as hell would get the attention of the people who aren't being told exactly what is going on)...then I am sorry that you simply do not understand the reason we NEED impeachment proceedings.