you do know that those cracks can harm/slice their feet pretty easily don't you....
I would hazzard to guess your steps are fiberglass, if you don't mind pumping the pool down some, you could overlay them with some automotive fiberglass and if the cracks are not wide, you may get away with painting on several coats of resin without the fiberglass sheet. Sanding is recoomended to help the bond between the old and new material.
If the steps are plastic, there is something similar for plastics - a thick soupy coating you can also "paint" on, just not sure what teh name of it is.
If you want some grip, maybe rhino liner (made for protecting pick up truck beds) also paint on - comes in many wonderful colors - not cheap though but definitely cheaper than replacing steps.
In any case, most likely you would have to pump your pool down since none of tehse things would apply well under water.