Bitcoin is a tool, like any other. Tools can be used constructively or destructively. The ease and affordability of transferring remittances internationally is the single most useful case for Bitcoin. In those instances value is not kept in BTC except for the duration of the transfer so it is not as susceptible to the market fluctuations. On top of that it is much faster and sometimes cheaper even for more local transactions like invoices for freelancers to be done via BTC.
The banking systems have failed in a lot of ways related to the above use cases. In the US it can still take days for a check or transfer to clear. Red tape and fees abound when transferring large amounts between parties. PayPal will just shutoff your account because they don't want the risk. etc. etc.
In the future I expect to see BTC to mainly utilized for these types of financial transfers and less as a long-term store of value. Of course like any item of value there will always be the speculation side.