/ Prices of apartments in Krakow are collapsing further down in 2010-2011
If you are referring to inheritance properties every Pole you know must be a single child or the recipient of a very big house.
Most of the people I know come from smallish families (maximum of 3 children). Their parents basically work every hour to provide a better future for them. I suspect this has been going on for some time and will continue to do so.
When I think about it, I don't know a single person whose family doesn't own some substantial assets (going by todays prices). This is only a personal observation, which could be incorrect throughout the majority of Poland.
It never ceases to amaze me the sheer amount of new houses being constructed out of the cities, by seemingly poor people. A lot of the time these houses are partly financed by credit and built on land which was inherited, using money which was given by families (even Grandmothers chipping in) the prospective builders will live in one of the parents houses or flats rent free for a number of years (converting a part of the house into a flat) whilst the building is completed over time to save money.
Imagine an outsider attempting to do that. First, buy the land which is surprisingly expensive, even for a moderately populated area, then find somewhere to live paying rent whilst you organise the building process, then find the money for the building, which if you're like me, You will have to find it, because families in the west are totally disinterested in your future. On a final note an outsider would probably need cash, because borrowing money as a foreigner will be very difficult in Poland and the UK banks are too busy lending money to foreigners to care about lending money to a National abroad.