I would either keep ticket prices the same, or make them more attractive at the lower end of the scale.
As a ball park figure for next season for the South Stand i would look at charging about £400, i'd charge £350 for John Street and open part of the stand as a non-family section and then for the kop and i'd open up the entire Bramall Lane upper and corner stand for this i would charge £200. I'd also keep junior season tickets at £50 a season. For a personal perspective Brownie Jnr is 7 and is on his third season ticket this season, and going to football matches is part of his life to the extent where, when i can't make it he drags his Wednesdayite mum along as he doesn't like missing games. That is how you get supporters young.
This would mean we are charging a premium for the two side stands with the better facilities and for the other areas of the ground you have just made it more affordable and more viable for people who might not be able to afford it to be encouraged to buy season tickets.