WI: The Empire Strikes Back was an “Irvin Kershner Film”

At the start of Empire Strikes Back, just before the title card “A Long Time Ago in a Galaxy Far Far Away” is another title card in a similar style that says “An Irvin Kershner Film.”

Everything else about Empire is the same. But because of the title card, George Lucas doesn’t get into a row with the DGA that results in him resigning from the guild.

How does this affect things going forward.