Including KE there are about 5 Korean carriers flying to Guam. In the the years I was there Koreans took first place from the Japanese in tourist arrivals. Not a bad place if you like diving and kite boarding but the food is not great, its expensive and no good hotel options unless you can afford the big chains. BnBs and guest houses getting popular.
I think it will another month but there will be countries that will extend flight bans. What happens if people have nowhere to go (Example India) ? If people can’t extend but have no way back to their country it will be tough