It might be a long while off, but I am sure that something else will come along along the lines of SJA. It was hugely popular and there is a gap in the market now. I'm sure the BBC would be keen to get something else on the go. Assuming they have even realised that the show has ended given how little order there seems to be there at the moment
Well, as it's on Children's TV, I suppose it wouldn't get in the way of the really highbrow shows like Simply Come Dancing and How Do You Solve a Rainbow Like Joseph.