What if when series 4 starts, it says ‘5 years later’

What if that’s how it starts and you see John and Sherlock going through a short case together like in season one and at the end of the day John just says “hey, I’m off to bed. Are you joining me tonight?” And Sherlock says “I’ll be with you soon. I just need to finish organizing the case information.”

Then the rest of the season explains how they got there