I would never use "nofollow" on a good source

Linking to them means voting, a vote that proves that the site, or that certain page of a site, has quality content. How would search engines rank sites based on their popularity? Besides, if we all use
PR sculpting then what's the use of link building? SEO will slowly die, well not the on-page optimization at least.
[thinking]Although at some point it'll be good because only quality content sites will appear on SERP and black hat optimizers will be completely eliminated.[/still thinking]