Bitcoin is still growing and does not yet belong on etf markets. ETF'S are to similar to stock markets, which would only taint the purity of bitcoin and demoralize the values it stands for. Bitcoin is better off independent until it matures and is managed by new era leaders and agents of this generation. The world needs new money, new leaders and new ideas to move into new era.
Probably you have a point but, I also think that Bitcoin does not need an ETF because as decentralized system, anyone can join Bitcoin economy. They don't need the approval of SEC to join the community. After all Bitcoin and regulation does not fit together.