Bitcoin is a currency that is still developing and could possibly make it to a point that it would be allowed to be used in online transactions.
Tell me your opinion on this topic

For now no, Bitcoin value still not stable. Let's say for example you bought $10 T-shirt worth of bitcoin and send it to the store the value may not be the same when he recieve the bitcoin it may be increase but what if the value suddenly decrease. This will cause confusion and big loss on the owner of the store