I don't know much about bitcoin integration in e-commerce but if you have the programmers to do it, you can actually do it with ease. The only problem with that is you have to always update the prices because it is volatile and minor change in the market could be a profit or a loss for your company. To answer the title, I think that it will be difficult for bitcoin to become a standard currency for online shopping because there isn't much bitcoin to go around and there are a lot of people who are doing their shopping online as of this moment and I think that bitcoin would be enough to shoulder all the transaction and it is also worth mentioning that there is still a problem with slow transaction due to the network being congested because there are a lot of transactions.