Cancelling the most advanced variant of Typhoon is surely going to be a backward step, a Tiffie with full strike capability will be more effective than a Tornado GR4 in terms of payload especially, while in close air support.
Typhoon's persistance will be nowhere near matched by the JSF unless the MoD buys the SDB. Bear in mind, development of the VTOL F-35B is far from a satisfactory stage, the engine, gearbox and vertical lift system is so complex, its questionable whether the technology will be mature and reliable enough for shipborne operations. There are still far too many questions over JSF, whereas Eurofighter is ready to go, and will shortly get its chance to be proven. Hopefully the Saudi order will knock down the price per airframe for the MoD to re-think this idea.
