I suppose that there's only two of them so you are right... Technically haha. There are a few others who have most of if not all of their members still around, but I did derive certain acts which only have one or even no remaining original members for a reason haha.
Disney continues to budget for Candlelight because it is an essential portion of Epcot's holiday festivities and has been for 30 years or so. If it went away, there would be much more uproar than with other productions. Personally, I don't think they're paid too high, but using it as a baseline for Candlelight in particular, which is reasonable, it does amuse me that Disney has kept it around largely unedited in terms of accompaniment (but not content) for decades after major entertainment cuts began that continue to this day. Fans would probably riot if it was cut.
As for Equity member payments, while I have no reference for anything past 2017, as I am not a member of Equity and do not have access to more recent deals specific to WDW, they were getting paid about $18 an hour for lead vocal roles - as a show is budgeted to last an hour, basic math essentially says that even if you double it because of inflation and through negotiation on the part of Equity it's a fraction of what the orchestra is getting paid (as I can only assume it's about that much of not slightly more, as the local musician association also doesn't publish their rates, although even to this day most other musician associations within Florida charge cheaper rates than that).
