If a company like Apple themselves come out and say "guys, it's not safe to use our phone as a gps navigation tool" this to me says one thing and one thing only: Apple will soon launch their own gps navigation tool or at least a new phone that is "now safe to use on a bike!!!".
Classic Apple business model if you ask me: they're exploiting a problem that may or may not even exist in order to create a need for a new product. And yes, all the apple fanclub chumps will jump to the opportunity to buy this new thing.