Seeing as how the twins are such a success (so far) ... and they must've generated quite a bit of revenue with all the phone voteds they've received ... perhaps the show DOES need an act that's a little bit ''different''. 
Louis reckons that it's all good coz the lads are young, having fun and living their dream ...
So next year why don't the judges put through that rather plump blonde girl ... (you remember the one from a couple of years ago ... with the dad-made dress?) .... she turned up again with her sister this year and doubtless they'll be along again next year.
They'd be different and though they can't sing and probably can't dance, they'll be two young girls living their dream.
just a thought ....