I went ahead and booked it after reading the FT thread on the topic. New route is MSP-LGA/JFK-NRT-BKK. For those wondering, there was no Fee involved for changing the routing. Origin/Destination stayed the same but connections and date changed.Yes, I would say definitely a better product. But up to you if it's worth whatever additional time/effort the connection in Tokyo brings. I'm not sure what product they have for TYO-BKK and if this sector is operated from NRT or HND.
Assuming the connection time doesn't affect overall journey too much, and you don't need to schlep across Tokyo to change airports, I would personally take JL F over CX J. Given the impending increase in F costs, I'd much rather lock in the certain gain than wait out CX and hope! Just my personal choice though.
We'll get in to BKK the same time we would have with CX J and it doesn't involve changing b/n NRT/HND. The NRT-BKK flight is only 2 classes so its more J than F, but the long JFK-NRT is F and that's what I'm most interested in.
Now to figure out the return. I'll start a different thread so I'm not just taking over this one =)