Did Aeon fork into 2 chains?
Technically yes (as is always the case, there is always someone who doesn't upgrade) but there is no evidence of any uptake of the pre-V7 chain (no exchanges listing it, no projects claiming to take on support of it, etc.)
One advantage of Aeon over Monero is it can fork but does not have the risk of splitting into 2 or more
supported chains because the community is small and can be herded in 1 way towards the
real chain.
What is your assessment on Aeon as the first to test Bulletproofs and be the first Cryptonote based coin to release it with RingCT enabled? I reckon the developers should keep pushing it while hardforking is easily managed and while everyone is not looking hehehe.
If Aeon grows larger in the future, illegitimate forks like Monero Classic will emerge inevitably just because the financial stake becomes higher. Whether the community is united well or not won't matter much.
The first CryptoNote coin that adopted Bulletproofs is Wownero, AFAIK. Some may see this as irresponsible of them because the audit process funded by the Monero community is still going on, but others may see it OK because Wownero is supposed to be a joke coin and is allowed to do wild experiments.
To me, the most reasonable path for Aeon would be to adopt Bulletproofs a little after Monero adopts it, because that way we can be sure that it's working well and has no issues. As someone once said somewhere, maybe Monero is Aeon's testnet...