Adding to vishnu's argument. Triangular and Quadrilateral series are the future along with franchise.
I believe that in the IPL, there is a clause which require BCCI to get the approval of all the existing franchises, if they want to add additional teams. And most of the franchises have already voiced their opposition against any proposed expansion. It is not going to be easy for Jay Shah and Sourav Ganguly to convince the franchise owners. BTW, I am skeptical of your proposal of 12+ teams. In England they do have 18 teams and they are managing it quite well (with generous help from the Kolpak players), but I don't know if the quality can be maintained in India, if the number of teams are increased to 12+.
India has about 35ish domestic teams and if they can't find players then its shame IMHO. Even if players are average then i believe IPL exposure could help youngsters greatly.