I have been using bitcoin for payments for over a year now (gyft.com) and earlier, the transaction fees were lower but even now as long as the price settles down for even a day I can usually get a transaction in for under $10, sometimes even only $5. Yes, this is a problem simply because if the price rapidly goes up a lot it would be harder to spend, and it is important that the lightning network get developed as quickly as possible in order to increase the ability for bitcoin to be used as a payment method. With the fees I mentioned above, and in a low transaction time (which happens daily to once every few days), a transaction would most likely confirm within 10-30 minutes (Any more would simply be because a block has not been found in a while). Quite honestly, I have tried using ethereum before (for cryptokitties), and I was shocked when my transaction fee was evaporated and the transaction itself never occured (That is, it ran out of gas). At least with bitcoin I know that it could just be in the mempool, and if I wanted to I could put it into a transaction accelerator.