I just don't get the idea of "mobile mined" blockchain. Nothing can prevent anyone from developing a GPU miner for it, where one GPU will beat army of 50 - 100 phone-mining losers 
Actually, a lot of things can prevent you to do so. A freaking LOT.
(Even something sounding utterly stupid like "limiting the unitary hash number" does not sound stupid at all when you have 1 Billion devices...
But I agree on the fact that these things can be hacked, patched, hacked etc... like anything in the world.