User blog comment:SwagMasterDbl/My Fan-Made Infinity War Third Act/@comment-26917787-20161221051606/@comment-26917787-20161221061154

The hero lineup can change; I just feel that it would be too much for one movie if we have to see Thanos:

A. Collect all Stones (and win a large battle to gain each stone) B. Demonstrate his ultimate power C. Finally be overthrown in a grand finale battle All in 1 movie

It would feel rushed, anticlimactic, and dissappointing if there was only one film for all that.