The biggest benefit to bitcoin is always going to be greater real world use, this could be brought about by all of those mentioned but I think the most effective would be by more sites accepting it. For example major retailers such as amazon accepting bitcoin would be absolutely huge and lead to an enormous price spike in my opinion.
Amazon Is accepting it and they took a great initiative as by seeing them more store will allow their costumers to pay in bitcoin and this will give ease to the store as well as the payer, this will increase the popularity of bitcoin as well and there will be increase in depend if people start using it as payment there will be more price rise for the sake of investors profit.