The poster mentioned change as in change of POW, “or some better model”.
The poster meant that changes
have to be made sometimes. This is all he said. He didn't mention any new models that are greater than PoW and I doubt if there is one. He said that there may be in the future and that PoS won't replace it.
Are you still saying that changing POW into some other “innovative idea” would be a good idea for Bitcoin?
No! I never wrote that we have to change PoW with something better. I've already said that PoW is the greatest choice, I just don't know
what the future holds. How sure can you be, for example, that RIPEMD160 will be safe from collisions within the next 3 centuries?