Until the day that bitcoin is the only globally accepted currency, and by that I mean the only currency in the world, then of course the price will matter. Frankly I don't think that day will come and so for me the price will always matter if I own some bitcoin. I would own bitcoin with the hope of growing my dollar amount.
I agree many people was actually invested on bitcoin because they want to get a profit out of it ! meaning the price will always matter ! Imagine if bitcoin has no value I doubt if people will still use bitcoins.
If bitcoin doesn't have any value or a high price then people will be lesser in terms of amount of users than now because the price is only one of the attractions of bitcoin and whether we accept it or not, the price is the only thing that matter for most of the people and that is why they are keep coming and staying in bitcoin because of the price.
Of course it matters , but more importantly I would say that it depends on the use you have of the BTC. If you want to invest, so the value may be the only factor you look at. But if you are really interested in the advatanges BTC offers and want to use it, the value is less important.