I think BCCI will remain like this for many more years because the craze of IPL is growing not only in India but abroad too. If BCCI is able to launch WIPL and if it is a success like IPL then BCCI will be unstoppable. They are already controlling ICC and all other boards do know that therefore they are unable to unite on one point. IPL is the biggest success story for BCCI and it will remain like that for many years to come.
Yes, even after the start of different T20 cricketing leagues no league is able to be popular as IPL. The game got started at the right time, and the plan of franchise making is really good. As said even if some event like World IPL happens, if isn't a surprise. Already IPL teams have turned themselves a brand and CSK one of the franchise have bought a team in South Africa league and the name too is supposed to be CSK Johannesburg.
Every team in IPL spends a lot of money. And the management of IPL is better than other franchise leagues. India being a huge populous country IPL is getting bigger day by day. While IPL's teams were limited to India until now, it is now spreading globally. This is really good. As a result cricket will expand. And the general audience will be more attracted to cricket.