If there is a major doctrinal change coming, it's almost guaranteed to be the 144,000 becoming symbolic. They've been putting the pieces in place for the past several years - reducing the "importance" of being anointed, throwing shade on partakers as possible a little nutty, removing all "authority" from the remnant by making only themselves the F&DS. Rising partaker numbers is still a problem they can't explain away.
I predicted to someone 4 years ago that, within 5 years, they would drop the 144,000. I still think that's very possible.
I think that's more likely than 1914 being dropped.