One looming fact is that the T1As are old and have limited shelf life, they are not going to be replaced on a one for one basis by Hawk 128s so something has to give. Once Typhoon is established, would it not make sense to allocate one aircraft from each of the Sqns up to a maximum of say 6 this provides redundancy to cover operational requirements. The result would be a far more impressive display by a really fast jet, reduced overheads and a public which actually sees something of the aircraft it has paid so much money for. Yes it can still be called the Red Arrows.
I'd pay good money to see a Typhoon equipped Red Arrows.