Oh, I forgot to answer the question

Anyways, the male Girls Aloud will fulfill their contract, then take a hiatus after album 5 to pursue solo projects. After a few years they will come back together for a greatest hits album and reunion/farewell tour. Their solo endeavours will play out like the girls:
Cheryl = Liam: the most attractive and marketable. Successful but local to UK.
Nicola = Zayn: the 'coolest' member who will make a flawless but underappreciated album or two.
Nadine = Harry: his ego will drive him away from the boys and will be his downfall. Solo album flops.
Kimberley = Louis: just there (plus I could see him releasing a show tunes cover album

)
Sarah = Niall: alcoholism.