I would think it would be a nice idea if players earned their Offline Raid Protection by being online and playing.
E.g. a player that played 10h a day would have maybe 10h protection after. A player that only spend 3h playing would have 3h protection after and so on.
This would maybe do players play more cause atm if you have 100% protection players play less automatically and go offline a lot cause they're safe.