Not really. Reasons why most of the groups uses druids is simple - they are not just healers but supports as well. They provide fury, might, swiftness, regeneration and unique buffs with spirits and they also help with vulnerability on bosses and also provide passive buff spotter which lots of classes needs to get 100% crit chance. And they have tons of CC. FB cant really substitute this. No spirits, no spotter, no unique buffs (maybe signet but thats not that great) and not that great CC or utility. Also you should think about mechanics - as FB for example you cant really push seekers on Vale Guardian while druid can. Other thing is that with FB you will alwayes have at least 1250 toughness which will force either you to tank or your tank to rise his toughness (most chronos i know tank with 1005 toughness) and if you will tank VG you cant distort greens for yourself like chronos do so you will propably get downed a lot. If you do overheal tactics of course which even pugs do in these days. If you want to take firebrand as support into raids you can do it with some hybrit compoziton - firebrand, alacrigades (you can provide 10 ppl with alacrity as revenant with correct traits i believe) but you still need druids. And its usually not the most effective setup for your group. These compozitions are great for fractals mostly. One more thing - in raids you dont really need 2 healers. Experience ppl can do with just one druid and sometimes even without druid just with soulbeast with spirits(sabetha for example). Only thing that really dmgs you is boss aura and thats all. If you are exp player of course. So there is no reason for exp players to even consider bringing classes that provide less support but more healing - like scourge, fb, scrappers etc. You take those healers for only one reason: to carry training groups and thats it. In raids you dont have classic trio heal, tank, dmg - you have more like heal+support(harrier druid), heal+dmg(condi druid), tank+support(one chrono), tank+dmg(off chrono), dmg+support (banner slave warr) and then dmg. So as long as fb and others cant replace druids or chronos and provide some unique buffs they will stay mostly out of meta.