of course the price matters. it matters for 90% of the people who bought their coins. if the price is stable more people are willing to convert their savings into bitcoin. which isn't the case right now.
It matters at the moment! Everything's value is priced at fiat money. To gain value bitcoin has to be pegged to fiat money otherwise it is useless. The Bitcoin's ecosystem doesn't complete yet. So you have to convert BTC to fiat to spend them!