Hopefully you will all have fun meeting singles and try out this online dating thing...
Some women prefer not to date men with kids..that's a preference. The child isn't remotely close to passing for another decade at least - no one needs to be alone during such a long battle.
But I'm sure if you keep trying you'll find someone to accept you and your child. Good luck finding a decent lady to share your life with :) All the best to your child as well.
I wish the both of you a lifetime of happy memories.
HR I don't think it's wrong to want to date someone if you have a terminally ill child.
I can only imagine what the child would feel if he was to learn that you were dating already - before you were even divorced from his/her mother (unless you think the child is mature enough to handle the situation).