Of course this isn't new by any means but you are right about it being more universal amongst all the pro footballers.
Georgie Best set a trend in hair fashion that was copied by some. The Beatles "cut" was also noticeable among the players. Then there was Kevin Keegan etc.and his affro.
But today there does seem to be a vast majority of players in all leagues having similar groomed styles.
They are just dedicated followers of fashion...!!
Indeed my 10 year old footballing grandson and his team all have them too !!!
Even some of the England Rugby Union team have them.
Ah well... it's called progress I guess.
Gnu...Wayne Rooney was accused of frequenting " night ladies" one of whom was said to be a grandmother.