They could but they would not.
You see, airlines pay a significant portion of the purchase price (ie 10-15 %) before delivery so Boeing has already received down-payment for these planes. If the airline does not take delivery based on the contract terms, Boeing is free to remarket the plane and keep the deposit. Remember the PAL 4 undelivered B747? PR was forced to take 77W in lieu of 346 and apply deposit payments there. Fortunately for them they have the same GECAS and US Exim bank to finance those jets.
Chinese carriers has already taken delivery of Boeing 787s and 737 maxes. So they would not be affected. New orders could be. PAL could theoretically purchase other 787s or 737 max that other Chinese airlines failed to take delivery similar to what El Al did, but the price would still be the same, unless Boeing sell it at steep discount less deposit payments, which usually happen when you take substantial frames, in the fold of Ryan Air or Fly Dubai. Most likely interest would be the 787s but there would be other airlines too who might want to start bidding war with PR for the same freed frames.
Making Sense