It really doesn't make sense to adopt bitcoin when its transaction fees are higher than other alternatives - at least to me. Of course I'm not talking about other users - bitcoin is an option for anyone regardless of transaction fees.

Easy transactions and low transaction costs are some of the advantages of bitcoin compared to other currencies - so when transaction costs are very expensive ^{[beyond reasonable limits]} then adoption barriers can certainly occur. I'm not sure how many users are willing to pay hundreds of dollars in fees to send bitcoin as a means of payment when they want to pay for something - this is a hard thing to accept without considering it a problem.