The market capitalization of bitcoin is so big. If you want to pump it higher, you need a lot of volume. This has not happened.
Compared to gold,silver, stock index, real estate, companies like apple, google or Berkshire H. Bitcoin's market cap is a dwarf!!
There's so much potential for increase and it just takes some huge speculators to jump on board.
Sure this will not happen over night and Bitcoin has to grow and progress much more. But if everything works out fine the time will come.