EA wouldn't go on-record to say exactly why the mode was cut, only just confirming it again through public-relations channels. An email statement noted, "Head-tracking was something we considered including as an Easter egg in BOOM BLOX however, we did not end up including it in the final version of the game. ..."
Perhaps EA feared that we'd hack together a candelabra helmet as an IR emitter. They should have; we totally would.