As I type, I'm currently waiting for a new Rock Band bass drum pedal to arrive and replace my broken one (snapped on me last week - was bound to happen, but still). In any case, hopefully I can confirm that EA's warranty policy is solid for this game if this piece arrives sooner than later.
In the meantime, I came across a fun little feature about how Rock Band saved a woman's marriage. It'll leave you all warm and fuzzy-feelin' inside, I hope:
http://www.salon.com/mwt/feature/2008/05/27/rock_band/
Cheers.
