No, of course not. The restrictions on iPods may be perfectly understandable as an emergency, temporary restriction in response to an imminent threat. As a narrowly limited restriction in place for a few days in response to a specific threat, it seems defensible.

But as a long-term defense, of course, it would be totally stupid and pointless. In the long run, bans on iPods serve no useful security purpose, for all the reasons you mentioned, and many more.