^ thats not fair, Luke Smith is a genius, he is something quite unique a being who could possibly be the equal of the Doctor, some stories are going to be Sarah Jane saves the world with just her sonic lipstick, others are going to be stories where Luke does all the hard work.
I would hate to see Luke held back, from a great destiny that I believe he should have one day.
Fine, Luke's a great character. But turning Sarah into a whining woman who keeps shouting 'I'm his mum!' is a bit like the old Sherlock Holmes films where Holmes only looked good in comparison with the idiot way Watson was played.
Watson should be an incredibly bright doctor who's nevertheless in admiration of Holmes' superior talents; Sarah should always be the human who the Doctor was impressed by, and hence someone who's capable of raising someone who might equal him - not a whiny over-protective mommy, which she drifted towards last season.