Start thinking of yourself as a leader and inspire others to thing the same way. Talk to your friends, family, relatives, classmates and everyone around you. Politics is everybody's business. When good people stay silent and do nothing, bad people come and take over. The groups can then organize and coordinate through encrypted sites and forums. I will not say who will do it, but it will start at some point, if all of us start taking initiatives.
Don't wait for a leader, be a leader your self. And lead by examples. Act instead of talking. The first step is to talk to people around you and organizing people around you.
Forget Ershad. These old style leaders have no clue. They do not care about the country or people. He is worried about becoming president one last time and will do anything for anyone to become one. Pro-India AL must be defeated in next election, if Ershad can help this effort, I will thank him. So far I put my bet on BNP led 18 party alliance to defeat AL in election. That is what all of us should support as immediate goal.
While for the long term, conscious Bangladeshi citizens should start organizing outside of political parties.