I have to say that my favorite part of the entire episode today was Sumantji's statement that Maharaj Dasharath had called only Ram and Sita to the sabha. The fact is that she assumed that she would go because she is Ram's mother. She was genuinely shocked to hear that she was not allowed in.
Despite the fact that Ram is the avatar of Narayan, which presumably Kaushalya knows subconsciously, she is a mother first and foremost. Above all, she wants to protect Ram from anything and everything that could potentially harm him. When she is rebuffed by Sumant, she realizes that she has to let Ram face this next aspect of his life head on. She can no longer clear the path for him and ensure there are no thorns. Her role she must now delegate to Sita, and from now, she can only be a cheerleader on the sidelines for her beloved son.
It is very interesting to me to watch this transition. All mothers love their children unconditionally - that is the very definition of motherly love. However, after a point, all mothers must learn to let go, and allow their children to blossom on their own. If they do not, if they try to hold on and keep them safe, they are causing harm to them, however inadvertently it may be. How beautifully poetic and sad is it, that the truest, purest, most heartfelt love is the one where you are willing to let go for the betterment of your child!
I also don't know if this was intentional, but by barring Kaushalya entrance to the sabha, Dasharath realizes that this is a journey that Ram and Sita must take on their own. He realizes that Ram and Sita are embarking on a journey on which they cannot follow. Dasharath knows all along that his biggest downfall is the excessive "mogam" that he holds in his heart for Ram, but he is unable or unwilling to change that. Who in the world can say that Dasharath had selfish intentions with regards to Ram? He loves Ram more than his own life. His only flaw is that with his excessive love, sort of like the case with Guru Dronacharya (from Mahabharatham), he stifles Ram and doesn't allow him to grow for himself.
This scene, in my mind, although not in the original Ramayanam, was a pleasant addition. It is a reminder that we should not hold things that we love to ourselves selfishly - that is not true love. True love is planting the seeds of good values and kind intentions, then stepping back and watching those seeds blossom.