I think Rumbelle has a better chance of succeeding now more than ever.
Their relationship was built on a lot of “but somewhere in there is good (even if Rumple’s doing something bad 99% of the time)” and “she supports and loves me (because I lie to her on a near-constant basis)”. There is no way, without Belle doing what she did, Rumbelle could have lasted.
Power is Rumple’s addiction, but Belle’s ability until now to blind herself to the truth of who Rumple is (and not who he can be) was perhaps even more detrimental to their relationship. She was the definition of enabler. But to see Belle finally hit her rock bottom – finally realize much of what her relationship with Rumple is built on are lies – was the first (amazing) step toward their recovery. I was so pleasantly surprised by how much Belle there was in the episode (and I’m not, admittedly, her biggest fan). When they showed her waking up (did Rumple dose her or something?) I was just “ugh, here we go again” but her awakening was wonderfully done, and (to me) as realistic as it’s going to get on OUAT-land.
Rumple…has not hit his rock bottom, in my opinion. Nor is he close to it. I think before he even gets there, he’s going to actively choose power over Belle (she’s already gone, so, mindframe). As mentioned, Rumple’s finding a way to not only survive outside of SB, but thrive and start another plan to get what he wants back. He learned NOTHING crossing over the line. I think Rumple will eventually be redeemed, but it won’t be for a long while – he’s got a lot of darkness in him and I think we’ve just tapped a bit of it.
So Rumbelle has a long way to go, but I do believe it’s not only salvagable but will finally become healthy – once Rumple meets Belle halfway and has his own awakening and learns the error of his ways…