Yes, they call it a potential "emergency measure", only a one-off for desperate times and only for poverty stricken southern European basket-cases. But... once the idea get lodged into the heads of politicians, particularly those on the left, an overwhelming secular trend in support of asset taxes or wealth taxes will result. Why? There is no other politically viable alternative. In my crystal ball (ten bucks, on sale) I see widespread adoption - including in the U.S. - within ten years.
Bundesbank proposes wealth tax for EU states facing bankruptcy