I think the Luna Classic will be forgotten and abandoned and the new LUNA will be the new one and main focus, they will fix all the problems that happened on the old LUNA and improve it.
As Do Kwon and Terra team announced, they won't bind new LUNA with UST. I think both LUNA and LUNA Classic will not relate to UST but because the core team move to new LUNA, the future of LUNA Classic is very gloomy.
It will be like Ethereum Classic that does not have too good development many years since the hardfork after Ethereum DAO Hack.
Even Do Kwon and Terra did not mention about UST, do you think they try to rebuild a new LUNA and pump it to cover their loss in UST and compensate their investors.