Considering that when firelands goes live, all the current valor purchases are being dropped to justice points.
The 'we should have to go back to farm for gear' arguement is kinda obselete except for a few pieces of gear. It is going to do exactly what wrath did by making new badges farmable from heriocs. Just without changing the actual badges you get from it.
I Personally have slouched with gearing my offspec, and instead have spent my valor on BoE boots everytime i got enough and sold them for gold. Because as soon as 4.1 comes i ca cap my valor with 3-4 raid bosses and hcs. then 4.2 i can get the epics for justice points.
It Will be the same again, the only difference is the NoN-Removal of drakes. Which means you will go back to complete it to then get your drakes, Something witch Naxxramas didnt have.