I hope you'll find the following links useful. In particular, it's important that you use links to the various consultations that have been set up. Whether or not I agree with you, it's important that people make their views known.
Hammersmith Bridge Taskforce updates:
"Hammersmith Bridge closure" page on LBRUT's website
Transport for London's consultation page
Transport for London's status update page
Finally, my Twitter link.