Delph, how many Brits are drawing benefits from the EU countries they reside in?
Only a small point, but you could've received up to 7000zl had you paid the right amount of sickness insurance. It's too long winded to explain here, but the maternity/paternity payouts depend very much on your contributions as opposed to being set at a fixed level. If you were employed, you'd get 80% of your salary.
You seriously, believe, Poland is going to kick me out of the country and pay for the upkeep of my child?
No, what would happen is that all these non-EU citizens would be suddenly required to comply with the same rules as the rest. It's no big deal for those of us actually established and with legal paperwork here - but there are untold amounts of Brits all over the EU that simply haven't bothered with any local formalities, especially in Spain.
Can you honestly imagine Margaret and John turning up at Malaga Airport and being told "We need to see proof of your income, health insurance and oh yeah, you've only got 3 months here?". It would be a nightmare - and so the UK would inevitably do a deal with the EU to protect freedom of movement of everyone.