this is not a problem... in altering the ratio to 1:50, just remove the crew who spend the flight in the galley reading magazines and complaining about their social lives, there's always one or two. The remaining FAs will not have to do any more work than before and have the bonus of less irritation due to 'carrying' their 'work'-mates, thus leading to an overall improvement in morale.
This is, I believe, what they refer to as a Win-Win...
And less of those annoying un-planned slide deployments, too.