It's not that popular online. Like as in online shops. Just try and see how many online shops that accept bitcoin you can find. I mean the list is growing by the day but still bitcoin payments are still in their infancy. But still, from what I can see things are looking up, slowly but surely.
I think the online store will not be used every day. you can not be spending then always pay the shipping costs continually, perhaps if it had been a lot of offline stores that accept bitcoin we could use bitcoin everyday
Even if it's not popular with online stores in your jurisdiction I believe with time as more people get on board it will gain popularity online too. Secondly, it needn't have to be used online alone but can interchangeably be used for both online and physical shops without any cause for alarm.