Jagex needs to make one bite things that heal 20+, are relatively easy to make as in same time as fishing a load of shark, and massive upgrades to cooking guild. Still, fishing will always own cooking, as even if jagex makes better foods to cook besides fish, they will be members only, and the majority of raw fish comes from f2p, and the market is already established, and I doubt "spaghetti" or whatever will take it away.