1. price volatility
I can't hold major stashes without fearing major losses.

2. bitcoin adoption
I can't use bitcoin whenever I want to.
It's hard to convert cash to bitcoin and bitcoin to cash because lacking supply&demand.

3. regulations
This discourages 2. (bitcoin adoption)

4. demonization the bitcoin as shady because of 1. (price volatility) and the pseudoanonymous nature using propaganda
This discourages 2. (bitcoin adoption)