Ya some proposal address this and ideas about luna ust minting, some with making a new bond ust to paid back later to help bring in funds and debt repayment etc. Right now the mint/burn on chain mechanism on terra classic is of, so the correlation of ust and luna is also “shut off” for. Burning just to burn seems a hope without a clear plan. Clearer plan and steos to bring back value to luna ust or both I think better route, maybe burning included dunno yet not enough info.
I doubt burning USTC has any impact on LUNC supply at the moment except USTC is used to buy LUNC. As it is now, the core team led by DO KWON doesn’t understand what to do with Terra classic now. It appears abandoned as most of the project on the old LUNA have now migrated off the chain.