I find it funny when Keynesians talk about bubbles. What do you think happens when you set interest rates absurdly low? You could make the argument it stimulates the economy, sure, but at what cost?
Schiff's misfire is especially relevant to this discussion, because it demonstrates the Austrian school's grossly flawed understanding of public finance and our monetary system (despite having valuable things to say at times).
Actually for me from the point of view of Mises and his praxeology everyone who uses his methodology to advise a policy is just guessing and expecting that his views are coherent with reality.[1]
Austrian school is very deep, and not a monolithic bloc like mises.org loves to say, there were Austrian economists who were not Mises and disagreed with his methodology, including Machlup and Wieser who were Mises student and teacher respectively.
[1]: More of that in here: http://mises.org/mofase/ch4.asp It's just my interpretation of his view.