Personal opinion only:
The cantina closing (with no offence to anyone) was a good move. I don't think the fare went down too well. I tried a few dishes.. Mexican isn't my go to cuisine, but I gave it a go. I got the feeling it was not hugely patronised (but obviously this is only based on my visits to the lounge seeing people going up etc) and clearly the changing to more generic fare was a response to "feedback" or demand.
However Spice Bar was ALWAYS popular.. people (inc me) going back for seconds etc and sometimes a fair queue.
I think there's a vast difference here between the two.
I would put good money on that by 2027 or whenever things may get back to some sort of normal Spice Bar will be back.
Right now it makes sense to use those facilities to offer food to patrons and have it more generic (as much as I would love it to be SB food) due to lack of buffet options.
I don't ever really recall anyone being super pumped about the Cantina @ BNE unlike the Pizza at PER or Spice Bar @ MEL which both have been very well received in the main imo. I reckon it will return. I sure hope so anyway