Some places -- not all -- were considerate in extending stays without hassle. Others, like Australia, wanted foreigners out.
As well, what happened this past spring was unexpected, so there were some grounds for compassionate treatment. Folks who get stuck this winter arguably put themselves in the soup.
So to be on the safe side, I'd suggest you look at places where, under normal conditions, you can stay for six months or more, if necessary. That of course means the EU in your particular case, as well as Turkey and Mexico, which have relatively painless routes to longer stays.
A country that kept hotels/holiday lets open during this first wave would also be a good bet as I would assume that they would do the same during a second wave. Do you know if Turkey falls into that category? Antalya does sound appealing due to proximity, nice weather, food and very cheap if occupancy is low.