I heard on a Perry Marshall MP3 That one can use a new domain and have it re-route to the old one. Then you set up another campaign and it will "re-look" at your site (After you've fixed it up). Is this the only option or can you somehow send the bots there again?
you do not have to create a new domain and reroute the traffic to the old one to improve the QS of your landing page. you just can optimize your existing site and if done correctly, that will improve your QS as well. QS is not an absolute value nad google visits your site often for each keyword and always updates the QS based on change. if it was one time absolute QS assignment, then people would get their sites ranked hight with adwords and then change it back to the way they want which is not an option
It is not worth the time and effort to save a "slapped" domain. Buy a new one or even better use subdomains, which are treated as a brand new site.