I think the decline came about not only in not having a personal vision but probably more in not having the ability to rule, manage and expand.
If there was a RRC and RC to do it all over again, they should include a heavy dose of social engineering to link the conquered territories at the base level
Today there are no kings. Only corporates. Ambanis / Tatas / Marans rule India.
We are at a stage where we cannot even get our neighbors to give us water... RJC or RRC just getting planted in today's world may not be a solution or idea. Forget RC or RJC...even Lord Rama would have a tough time in ruling us....