The only thing you'd lose would be some Seal of Truth damage because of the time you stay in Seal of Righteousness.
It's not like we'll be GCD capped in the first or even the second tier of warlords. If the Seal of Truth damage trade is worth it (15% AP and 30% attack speed, it most likely will be) then there's no downside to it apart from more buttons to press. Seals already have a 1 second GCD in Mists of Pandaria (Atleast in 5.4, I don't know if it was changed somewhere in the expansion) so we would not be losing GCDs. Maybe the last tier depending on how stupid haste levels get.
Read
https://twitter.com/Dakeshii/status/469941509878722560 and tell me we're not on the same page. We can't have equal dps to, say, warlocks because suddenly any fight we could use our utility on we'd become overpowered. The issue lies in that our utility is shared with protection and holy. Separate hand of * spells or give them spec-spesific powers and suddenly there'd be no excuse for our dps to be sub-par.
Either the fights need to cater to our utility (Buff our utility or design fights with it in mind) or revamp the utility.
I'm optimistic and calm because I know what's up. There's no point being bitter or complaining at them without valid points. All I am doing right now is waiting for Celestalon to respond again and take it from there.
I'm still behind the idea that some of the issues is how feedback is delivered to blizzard. Even just random people joining in on my conversation or posting in this thread is demanding things or talking as if they know everything. Feedback needs to be good, valid and constructive, not the way I see most people post here. Anaxie is a big exception because he has a clue compared to a lot of people.