I think the main point we need to remember is that Tempest is only doing such crazy dps because of its free cleave, and the fact that pretty much every raid boss released so far has cleave potential. That free cleave is going away, and a large portion of its st dps is going along with it. Even now, my tempest parses lower on dummy than my rogue or primalist, though those are both harder to dps with in practice.
When these changes happen, clerics will be doing more dps with their top 3 specs, and warriors will be doing (significantly) less dps. It's pointless to keep debating this with numbers we've seen so far, especially for encounters that are so heavily skewed towards the current tempest that will no longer exist in (what I assume to be) a few weeks.