Saw this proposed last year by someone.
The idea is that players should be able to play finals, SOO, test matches etc - but it's unrealistic to think players can play up to 40 games a year of top level RL.
The idea is that coaches would have to manage players so that all players only play a maximum of 20 games a year of regular season games.
This would reduce injuries, increase the number of professional players (squads would need a few more players) and make the big games, including internationals, more 'special'.
It would also prolong the playing life of many players by a year or two (less games per year and less playing with injuries).
There would be a slight drop in standard with maybe one or two players out each week who would otherwise play - but the other benefits well outweigh the small downside.
For international league, it means more guys get a run in NRL and ESL, and it means more guys will be fit and ready to play pre season and post season internationals without worrying about burnout.
I like the idea of elite players being rested from certain matches in order to prevent injury and burnout, to prolong careers, and to increase the standard of international games. A high workload is most likely to affect senior representative players, especially of their club makes the finals, plays rep and international RL.
However, Spitty raised some fair concerns about the 20 game limit, particularly for non rep players, selection of matches, and Jankulowski about memberships. I would tweak your idea in the following way. Players should be allowed to rest from club duty for the club game representative game. So, for example, if a player participates in City Country or the ANZAC Test, then they don't play for their club that weekend. Furthermore, players should not have to back up after Origin. Backing up for a club 1, 2 or 3 days after a rep game is too soon.
Since players missing club football can have an effect on spectator and viewer interest in a club game, for every club game a player is rested from, the affected club could be compensated 1/24th the value of the player's contract (with a maximum compensation payment of $30K per game missed).
Consider an elite star like Darren Lockyer, who has played over 30 games a year for most seasons he has been involved in the game (he played 36 in 2006). Let's assume, for the sake of argument, that Lockyer earns $500K p.a. through club, marquee and third-party deals. In season 2010, if Lockyer had been given the full rest after rep games, then he would have missed:
* Round 9 vs Melbourne (2 days after the NZ test match, he played 80 minutes in both)
* Round 12 vs Cronulla (3 days after Origin 1, he played 80 mins. Broncos had the bye before Origin 1)
* Round 14 vs Souths (before Origin 2, which he was withdrawn from for Origin camp)
* Round 15 vs Penrith (2 days after Origin 2, he played 80 mins)
* Round 17 vs Wests Tigers (before Origin 3, which he was withdrawn from for Origin camp)
The Broncos would be compensated $20,833.34 (1/24 of 500K) for the matches that Lockyer was withdrawn from for rep duty and resting. For those 5 games, they'd receive $104,166.67. However, Lockyer would be much better off for being afforded proper rest and recovery throughout the rep season, he'd be less likely to suffer injury during or after the rep period, and elite players like him could have a longer career, which would benefit the game as a whole.
One challenge is the cost of compensating NRL clubs for resting their Origin and rep players. As a rough guess, compensation could cost the game's admin up to $2.5 million per season. However, a streamlined administration under a new commission, and increased improved broadcast deals, could provide the money for it. Compensation for player release could also make up for the shortfall that clubs may experience when players are missing on rep duty.
The second is the effect on clubs' NRL campaign. If certain clubs lose a lot of players to rep duties, their NRL campaign could suffer, to the extent that they miss the finals. Increasing squad sizes would increase wage bills for clubs, increase salary cap pressure on the salary cap. I'm not sure the NRL would want to increase wage bills, given the reluctance to increase the cap. To create more parity for all clubs during rep football, a more radical solution could be to split the NRL into two separate competitions: a main NRL with 16 regular round games, and an NRL Challenge Cup with 8 regular round games that bookends the rep weekends (around the 3 Origins and City Country/ANZAC test).