Judging by the hundreds of BTC that were burned in the last hours of the burn period, the market price is probably higher than 1000 XCP/BTC.

One way to think of it is: if the burn period was still open and the return for burning 1 BTC is now 900 XCP, would people still burn? What about 800 XCP? 100 XCP?

I think people would stop burning somewhere between 1000 XCP and 100 XCP for now. It's up to the market to figure out what that cutoff point is.