Since they do have the True Love concept in the show, I feel safe (but maybe too safe that there’s not much to worry about) for Rumbelle and Snowing to never change and have the constancy of fairytale couples.
I don’t think they’d dare split up Snowing or Rumbelle… Ok, so it is possible they might have someone die (I REALLY hope not though!!!!), but I cant see them splitting iconic couples up via other lovers- they already did that for a season with the curse 😉 ….. That is what I will choose to believe & if anyone comes up with reasons not to, I’ll simply stick my fingers in my ears & hum ‘this is a song that never ends’ 😆 😉