I could cancel the entire trip including the MEX to NRT portion and get my full 100k points back, but then I would be looking at buying an extremely expensive last minute economy ticket from MEX to BKK plus lose my flight back from MNL to MEX via NRT.

I can't plan the ticket again at some other time, I am going for a variety of business events including an event I am speaking at, cannot cancel.

I was looking it seems there are still quite a few seats availabile on various airline on Oct 14th from Tokyo to Bangkok.

For the 2nd portion of the trip I could care less of what kind of food will be available, its only a 5-6 hour flight from Tokyo to Bangkok. In normal circumstances, I wouldn't want to fly economy for such a long flight but given the current circumstances its fine with me could care less. If I was flying in business, even with ...... food I can laydown and get some rest even better.

My real question is:

Say this flight from MEX to NRT takes off tonight, which I think it will, once I get to NRT if i just grab my bags and take whatever economy flight to Bangkok, will that cancel the return leg? (my original ANA flight from NRT BKK has been cancelled, and I wouldn't have made it in time anyways)