If something like this doesn't happen, game probably won't be around in 2020...
I feel like a "Starlocke" Island could be realistic though. Just have another rotating Mono event island that forces you to enter with a team less than 40 stars.
It could even have a real leaderboard of people who have completed the challenge and the number of stars they had. The energy could be dropped from 50 to around 25 or something since people will lose a lot (to be expected). Boss skills could be removed here too.
Rewards could be GSP or some DM or something rather than regular egg drops, since we wouldn't be trying to make a 'mon like in regular mono event.