1) More and more people using BTC DOES NOT help the price go up. The reason is as soon as you use the BTC, it is sold and converted into FIAT. None of the merchants want to hold BTC because of ridiculous price changes on a daily basis. The best hope for BTC price to go up is a slow and steady growth and MORE stability in the price.
Merchant selling causing price to go down is "largely a myth"
https://bitcointalksearch.org/topic/merchant-selling-causing-price-to-go-down-is-largely-a-myth-826203