Anyone working on this idea and submitting it to YC will need to have a solid answer to the following question. Apple can change their policies towards iPhone

Anyone working on this idea and submitting it to YC will need to have a solid answer to the following question. Apple can change their policies towards iPhone applications instantly (see footnote 4 in PG's essay, relevant quote: "The problem is not Apple's products but their policies. Fortunately policies are software; Apple can change them instantly if they want to.") What will be so special about your development platform that you will still stay alive even if/when Apple does so?