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Note: this was written BEFORE the gravity falls finale and carries on directly from weirdmaggeddon 2. This is how I imagine Dipcifica would happen in the final episode.

Stuck in the mystery shack, finally reunited with their friends and family that survived, Dipper, Mabel, Wendy and Soos are still far from safe from Bill. However, Dipper realised that something is still on his mind: Wendy.
He was not over her, not at all, and his traumatic experience in Mabel's bubble made him realise that she was his weakness, and his love made him vulnerable. Bill was able to use it for his own dirty tricks. He needed to move on. Luckily, at this point, he started to see somebody else in a new light...