Monero developers tried to avoid the two chains and they hoped that the chain with original algorithm will eventually die, but some people didn't agree so they decided to maintain the original chain and call it Monero Classic.
I suspect there is not much organic opposition. And I'm not seeing much interest in
this ANN thread. Bitmain has an interest in pointing some ASICs at it; they could even be behind the whole effort. They don't want people to keep bricking their ASICs, though I'm sure they've already covered overheads by mining with X3s and then selling them. I guess anyone who bought an X3 and doesn't want to mine BCN or AEON has this now.
I like Monero's argumentation and I agree with them that ASICs would cause centralization.
Did Siacoin ever fork to brick Bitmain A3 miners? How did that work out?