I could understand if emerging and innovative services started appearing that drove the use of bitcoins, but prices are wildly out of control for no reason currently.
The way I see it, bitcoin itself
is the innovative service. Value stored in bitcoin is more secure than any dot com, bank, or centralized authority vulnerable to fraud or the recent PSN-style penetration. It is unseizable, untaxable, and cheaper and more accessible than offshore accounts. Yes the value stored is speculation, but as we are seeing, with that risk also comes reward.
As long as bitcoins are liquid, the ability to buy goods with them directly has little extra benefit. Value storage is their main purpose and main business, bitcoin itself is the innovation, and services beyond exchanging are just extra icing.
I still share the concern about bubble formation, but the record strong volume (certainly in dollar terms if not bitcoins) seems to indicate a healthy market. However, it also seems that as experts are saying about silver, some consolidation would be healthy too.