One of our customers has a large domain with thousand of pages. Domain is not banned (results are displaying when you do a site:domain.com query in Google), but after Penguin&Panda updates the domain seems to be suffering some kind of penalty, because SERPS have substantially decreased. This is due to low quality incoming links.
All content is original and without any duplicates or on-page overoptimization issues
For internal reasons (not related with SEO), he plans to move to a new domain, and he's taking into account several options:
1- 301 old domain to new domain. This option ensures not loosing the present traffic, but he's afraid the penalty will be inherited
2 . Remove all content from old domain and just leave a message "you are visting and old page, click here to visit the new one", with a nofollow link to the new one
4 Completely remove the old domain, without leaving any message or link.
Which option do you think it's the best? Which advice would you give him?