And ALL the people I know that had children while they were still young continued their education. I completed my degree with first one DC, then two. Not everyone IS capable of being educated to a degree level, but all the 'teen mums' that I know continued their education after having their DC's, to the highest level they were capable of.
One of my friends is currently studying an OU degree, as she is fed up with working in NMW jobs. When her youngest DC turns 3yo, she is aiming to go back to FT work, at a much higher level of income than when she last worked.
I myself am starting an OU degree in October, as it is the only way to dig my family out of the hole we are in. I am lucky in a way that my family is going to pay my course fees and for my textbooks. Without that financial support, I would be stuck forever.
I know another two that have finished their training, one for a HLTA, one who is now a radiographer.
But not everyone has the ability to educate themselves to a higher level. Does that mean they are a 'problem family' because they aren't clever? OK they can't earn as much, but does that mean they shouldn't keep their DC's?
And a LOT of DC's get help from the pastoral care at school, and most of them have SN's. Have you any idea of the frustrations that can be caused by a primary school refusing to accept a DC's dyslexia, meaning they they join Secondary functionally illiterate? They KNOW what they should be able to do, they KNOW they should have been helped at Primary level, and they are often bullied for being 'thick'.
IMO, sort out the education system out first so that it picks up EVERYONE with SN's, and give them ALL the help they need to fully access the curriculum, no excuses, and then see the change in pupils who HAVE chances in life.
The education system CAN screen for those that need help - it is done Nationally at the end of Y9 to see who needs extra time or a scribe or a laptop for their GCSE's. Why in the name of hell leave it till Y9?! Do it at the end of Y2 at the very latest, and help them effectively through the rest of their school career. Crack down on bullying PROPERLY by having a national framework to follow, and ensure ALL schools, LA, VC, Academy AND Free Schools follow it.
Education is the key, especially decent SEN screening and SUPPORT.