It's obvious to everyone if they're honest that it favours the status quo. Even the SL clubs with histories of paltry crowds and poor results on the field are going to have to go some to get relegated.
Anyone wanting to go up has to have some serious money behind them. For instance if Wakefield hadn't got their new owner they'd be nowhere near SL once they got relegated. I doubt they'd be the big advocates for IMG that many of them are now they're assured of a place at the top table.
We're going to have to really push it to get into SL. Win everything we can and do everything we can off the field - even then there's a good chance we won't make it when you consider the incumbency bias. I can't see the game attracting enough money to go to 14 teams. We've all seen how SL clubs will protect their own interests (2013 TV money anyone?).
Taking the long view I can see this experiment being dumped in a few years. Whether there's much of a game left by then is anyone's guess. There are a lot of SL clubs that are making absolutely massive losses - way above clubs in the championship - so there's going to be a reckoning at some stage.