Well, V5R4's been out now for over a year and I'd like to think that most
people could have missed their Saturday morning cartoons at least once in
that time period and taken the time to load it.
V5R2's end of support is coming up in April. Several of the major
software houses have already said to upgrade because what IBM doesn't
support, they don't either.
End of marketing for V5R3 has already been announced.
http://www-304.ibm.com/jct01004c/systems/support/i/planning/upgrade/suptschedule.html
Rob Berendt