I'm almost certain we'll see double digits before 2016 and single digits are a possibility.
Reasoning?
There's no virtually no demand except speculative demand (buying BTC on the belief they'll be worth more in the future), the technology is immature and the economy is practically nonexistent. Actual use (number of daily transactions) hasn't grown nearly in proportion to the rise in price. There's a lot of wishful thinking going around in the forum.
I'm not buying at these prices. Not selling either. I sold a portion of my coins in April for $192/BTC, and I do not regret that decision.
"belief they're be worth more in the future" isn't a bad reason to buy unless there's reason to believe they won't be worth more in the future. The next reason you gave is "technology is immature," which can and likely will be remedied in the future, making it good to buy now.
Transactions don't matter yet because Bitcoin is more Gold 2.0 than Currency 2.0 right now. Not a problem; Gold 2.0 is worth an incredible amount to the people of the world, so that alone could drive the price up 1000 times.
Once we are above $10,000/BTC we can start to worry about transaction volume and merchant adoption.