^Indeed. I don't recall being realised six months after part 2 did 'Back to the Future Part 3' any harm.
Co-creator Bob Gale said he wishes it had been advertised as a trilogy. The way its done now. A lot of people felt surprised and cheated that their was no ending for part 2.
Of course it was a very different time. While it was known to fans a Part 3 was being made and would be out soon. Part 2 was not promoted as the second part of a trilogy. But if they were made now it would be.