I think they will retire it, but I agree that it probably won't be this management that will.
I heard about 30 years ago someone accidentally assigned someone number 14 but the matter was cleared a few days later, and the jersey was given to Hutson. But I don't think they will do that with the number 4 anytime soon, if anything its taboo.
This is from a friends blog so I can't take credit
With the 11th pick in the 1972 NFL Draft, the Packers selected Nebraska QB Jerry Tagge. It could've been a great story; Tagge was a hometown athlete who attended Green Bay West High, sold popcorn at Lambeau Field as a kid, and went off to college in Omaha, where he led Nebraska to back-to-back national titles. Tagge, who was the MVP of the Orange Bowl in '71 and '72, didn't offer exceptional talent, but played well under pressure in college and appeared to be an efficient field general.
Tagge sat on the bench in 1972 and watched Scott Hunter lead the team to it's first division title since the departure of Lombardi. The next year head coach Dan Devine created a chaotic atmosphere around the postion, shuffling Hunter, Tagge and Jim Del Gaizo at quarterback.
With the advent of the horrendous John Hadl trade, Tagge was cut during the 1975 preseason by rookie head coach Bart Starr. Despite not panning out in the NFL, Tagge played with San Antonio of the World Football League in 1976, and found success with the British Columbia Lions of the Canadian Football League from 1977-79. He took the Lions to the playoffs two of his three years there, and was MVP of the Western Division in 1979, before suffering a career-ending knee injury just as the Lions were entering the postseason.
Upon joining the team for spring training camp in '72, Dan Devine issued Tagge his familiar number 14, which he wore during his successful tenure at Nebraska. Eventually, someone caught the mistake and told Devine: The team had retired number 14 in honor of Don Hutson in 1951.
Fortunately, Devine's blunder was discovered before the beginning of the preseason, and Tagge was then given # 17, his old high school number.