Ok, so I finally got the chance to read the whole thing. After doing so, I have to take issue with the folks who called this a "balanced" look at Bitcoin. I suppose it's more even-handed than I would have expected considering the source, the European Central Bank, but that statement sort of falls into the "pretty nice guy for a serial killer" category. I do get the impression, as someone else suggested, that different sections may have been written by different authors because the tone / comprehension level appears to shift at times. But when it's bad, it's pretty bad. And there are some real howlers in there, e.g.:
In these schemes, the settlement asset is the virtual currency, and therefore the finality and irrevocability of payments cannot be ensured. Only central bank money can do so, because central banks present no default risk and act as lender of last resort to the member of the system in order to stop any possible chain reaction resulting from payment incidents or unforeseeable liquidity shortages.10 Virtual currencies cannot therefore be considered to be safe money, since the likelihood of the asset retaining its value for the holder, and hence its acceptability to others as a means of payment cannot be ensured. It simply relies on the creditworthiness of the issuer of the settlement asset. The level of safety is clearly below that of commercial bank money, as commercial banks are subject to prudential requirements and are supervised in order to reduce the likelihood of default, thereby improving the safety of claims on these institutions.
Here's the tl;dr version for anyone who doesn't want to slog through it. Some of the dinosaurs have seen the asteroid. They don't really understand what they're seeing. The dinosaurs are telling themselves they don't need to be worried about it. After all, they're so big and the something is so little, nothing more than a dot in the sky. And yet... there's a tiny part of their walnut-sized brains that IS worried.