Ironically, since then the ECB has moved significantly down the narrative of currency substitution, and in fact, following a recent push to eliminate paper currency (now that the €500 bill is no longer produced) the central bank has been urging for a shift away from real, paper money and into electronic variants.
However, overnight in a surprising reminder how the European central bank feels about bitcoin and other virtual money, the ECB urged EU lawmakers to tighten proposed new rules on digital currencies such as bitcoin, fearing they might one day weaken its own control over money supply in the euro zone.
In other words, first the ECB went after cash; now it is going after all virtual currencies like bitcoin.
http://www.zerohedge.com/news/2016-10-19/ecb-wants-curb-bitcoin-use-over-fears-it-may-lose-control-over-money-supply