In an ideal world :
Step 1 ) Make the best of what you have for now, raise every standards as much as possible (some clubs can't do much more than they currently do, others have a lot of room to improve).
Step 2 ) You now have a better product than can incite mid-size towns from non-heartland to join (think Salon, Roanne and obviously Atlantisman's Carpentras !). These teams remplace the smallest village ones and the reserves teams, bringing new money and new fans. You have now a real semi-pro league with minimum standards across every teams, the best of the bunch (Carcassonne, possibly Albi), being not far from full time professionalism.
Step 3) Elevate the thing to RFL Championship status with cross-Manche play off, and a direct access to Super League (whatever be the situation of P/R to SL by then) which then make it possible for larger projects from much bigger towns (Lyon, Bordeaux, a non basket case Avignon) to be put forward with an eye to Super League (that it may or may not be achieved is beyond the point)
Step 4) Enjoy a decent coherent package of french RL live on your TV !