The expectation for the past couple of months has always been that Brock Lesnar will defeat Goldberg at WrestleMania and will then go on to feud with Roman Reigns, with Reigns eventually taking the title from Lesnar.
According to Dave Meltzer of the Wrestling Observer Newsletter, the reason Brock Lesnar put Goldberg over so quickly at Survivor Series is that the end result of their feud would be Lesnar getting over on Goldberg.
Goldberg’s contract also expires immediately after WrestleMania, so the plan for now would obviously be for him to drop the title, though obviously anything can change and WWE could decide to extend his contract again.
The Goldberg vs. Lesnar match is also expected to go on last at WrestleMania as of now, according to Meltzer.
WWE also does not seem too confident in Goldberg’s ability in the ring right now, with him having two incredibly quick matches so far, though a lot of that could also be just to make Goldberg seem like a “monster.” However, the Goldberg vs. Lesnar match is definitely not expected to last too long.