Interesting question. Just going by wikipedia, the Wasp is bigger and requires more supporting infrastructure on the ship that carries it, so the conversion plan might no longer be possible. Having said that, the RN Rothesay-class frigates managed a similar conversion to carry Wasps, so it might work ok. It certainly seems like a more flexible platform than the drone, so it would have other uses. Even the drones were used as artillery observers, so we might see Wasps doing similar jobs such as SAR as well.