Perhaps, but I think it has more to do with Catholic school teachers preferring to let girls out of their classes rather than boys. By and large, their female students are more diligent.
One of the biggest perks of being an altar boy was getting out of class for a funeral or the daily morning mass. Now that the teachers can dismiss a more conscientious student, why bother to volunteer for the job when you'll only be working weekends?
Could be. Many Catholic schools no longer have daily Mass, I understand. We've always homeschooled, so I don't keep up too well with what the schools are doing, but it seems like the promotional materials I see generally say "weekly Mass."
It might be different in areas of the country where the Catholic schools have more Catholics in them. Where we've lived, they tend to be majority-Protestant students. Our parish doesn't have a school, and most of the kids go to public school, so this wouldn't explain our absenteeism problem!
I used to take my children to daily Mass, when there were fewer of them and they had fewer other activities. Maybe someday, when everyone's out of diapers, I'll have the opportunity again!