Bitcoin is better suited to be an asset than currency.I also prefer to make bitcoin an asset because it is far more profitable than using bitcoin for payment of goods or services.It is still remains as currency but it also can be considered as an asset because most of the people using it as trading material to make money but the property of bitcoin is currency which was found to be used over internet safely.
The reason you are giving in order to consider bitcoin as mostly an asset and not a currency is not true, it is true the biggest use for bitcoin is as an speculative asset, but currencies all over the world are traded in the same way in the forex market every day, so even if we are using bitcoin mostly as an asset bitcoin was designed as a currency and eventually it is going to be once again its preferred use in the future.