It wouldn't be any different to putting players names on the back of jerseys. But anyway, a way this could be done is that at the start of every season the coach picks he's full strength team from 1 - 17. These players then keep these same numbers for the whole year, with additional players that are used throughout the season would then wear the next number up on their jerseys. Players numbers are becoming less relevant in todays game, and in any given game you will find many players playing in positions that doesn't represent the numbers on their backs. So i say why can't we use this as a marketing opportunity and personalize players jerseys.
Another little thing is at the start of the season i bought my 8 yr old nephew a Parramatta jersey so i thought i'd get a number put on the back like i used to when i was a youngster. So i asked him what players number he wanted and he replied Jarrayd Haynes. So at that stage he was playing 5/8 so i got number 6 for him. Now all the sudden he is a Daniel Mortimer fan