That's assuming Dissipation would continue to dispel your fairy or anything of what it currently does. If DoTs return, SCH won't need the roundabout DPS gain that Dissipation currently gives thru Energy Drain so that it could be changed to do something else.
Looking at the average SCH on the forbidden site, they use Fairy Abilities roughly 20 times within a 7-8 minute fight.Again, even if you tie only Broils and DoTs applications to Fairy Gauge generation at half the current tick value, you'd generate 120 gauge per minute, enough to use Fey Blessing (which takes only 12.5 seconds' build-up) almost 5 times, while also further pushing Broil spam over heals (as Broil would now provide free healing that healing GCDs would not provide). You'd need to far more.
But the redundancy is also a significant issue. Do we really need both two Indoms (AF-Indom and FG-Indom)?
So approximately 2.5 abilities per minute, meaning at minimum, that's 62.5 gauge used per minute and towards 112.5 on the high end of the scale. The average used would be 87.5 gauge a minute. 120 gauge generation a minute vs 87.5 gauge used per minute. Now, this is also not factoring in that Blessing and Covenant would have their CD halved, allowing for more usage as well. You could see an increase in usage go up to about 26-30 uses in a 7-8 minute fight. You'd be at around an average of 95-110 vs 120 gauge generated, making it just barely able to outpace the speed of being spent. Ofc, this is assuming 100% uptime. Any DoT that falls off or any Broil substituted with an Addlo/Succor drops that 120 gauge generated and do you think that your average SCH can have 100% uptime? Does every single SCH keep their DoT rolling 100% of the time or does it fall off for 1-2 seconds periodically? Does your average SCH not use the occasional Addlo or Succor? What about Addlo+Deployment on a mechanic? You used Covenant for a reason, right? Hell, just looking at some DSR data, you see SCHs using Succor and Addlo well into the double digits so why do you cling to this notion as though generating X amount of gauge per minute is somehow problematic?
It's virtually a non-issue, even theoretically.
I agree with the redundancy part but that's more a problem with Healer Design being over saturated to the nines with Healing abilities. Do you need both Indom and Blessing? Not necessarily but despite that, both skills are used pretty often enough to justify their coexistence.