The rise of bitcoin is driven by many factors. In the end, the rise of BTC prices is due to the increasing perfection of its investment attributes. BTC no breakthrough in usage scenarios, but as an investment, BTC has already is an important investment target, whose nature is more and more like gold, its use value is no longer important, important is its increasingly recognized as an investment.
Yes bitcoin price should be constant because if its go down it will affect all alt coin. So that's why bitcoin must stable or go up do that market will be alive and the same with users and investors.