I think after the G20 summit, many country will try to regulate cryptocurrency and if it is a positive regulation then we will see a massive bull run(personal opinion). However, the market has always a fear, uncertainty and doubt as there is no such regulation. Its a normal trend for all kind of market to have this type of phenomena.
I do not think the G20 will have much influence on this world. You can see different counties over the world has different policies and most of them are learning this new area, so there will a long time to go.