The decision that no member of the Gandhi family will be Congress president has been taken by, wait, the Gandhi family. Also, any aspirant for the post has to seek the blessings of Sonia Gandhi first.
There are alternatives - Arvind Kejriwal, Mamata Banerjee, Nitish Kumar - who, just like Modi have been chief ministers of their states many times. Just because you may not vote for them you cannot ignore those who did.
On September 14, eight out of eleven MLAs of Congress in Goa, including former Chief Minister of Goa Digambar Kamat and leader of opposition Michael Lobo joined Bharatiya Janata Party (BJP).