I'd favor not a daily decay (people do get sick, have crunch at work, life happens...), but removal from a season a player who isn't playing set number of games per certain period of time. Let's say in 7 Wonders (pretty short game) 10 games each 10 days is mandatory. It's like an hour and a half per 10 days, pretty reasonable for a competitive player.
This way "camping at place X till the very end" is impossible, regardless what X is - 1 or 15. Camping shouldn't be a viable strategy.
This way "camping at place X till the very end" is impossible, regardless what X is - 1 or 15. Camping shouldn't be a viable strategy.