Don't know how you come to that conclusion. Only one expansion club as succeeded in my opinion and that's Catalans. I think its heavily stacked against Toulouse succeeding myself.
How you work that out or how anyone else is working that out I don't see the logic.
If Les Catalans are a success and if they are less reliant on Aussies now and producing their own players after six years, some of them budding stars, getting 9,000 crowds and attracting good local funding because French local govt work that way then when along comes the same sort of club, only in a richer and bigger city it ends up being a reasonable conclusion in my book that this is an absolute no-brainer. Switch to the dire need for competitive serious International RL in the northern hemishere and again it seems like a no brainer.
Why are Catalans fielding more quality french players?? I can only conclude bringing successful pro-RL to France stirs the interest in watching and playing it. Success breeds success and interest as it has done in Leeds, Warrington, Hull, Wigan and St.Helens where equally they attract big crowds, local sponsorship money and get the kids playing in larger numbers.
To see the inclusion as a "risk" and to doubt it is to prefer the alternative. What risks do we run putting Featherstone, Halifax, Sheffield or Leigh in SL? We know how badly they would struggle without private £millions. What was the actual record of putting Bradford, Salford or Wakefield in SL? The evidence is clear. How on earthe are Toulouse a risk and why do we worry about possible failure (the list of M62 failures in SL is double figures) when they clearly have more going for them than most alternative M62 choices??