Its difficult to place a 'prediction' as such, but I don't for a minute think that Arriva will fork out for 60 new buses...

What I would like to see happen -
12x Enviro 400MMCs (Sapphire spec) for service 7 to replace 6x E400s 7534-38/40 and 6x Pulsars 1514-17/22/23

Then -
7534/35/36 used to displace older E400 7519/20/21 at Belmont for service 6.
7537/38/40 used to displace Pulsar 1524/25/26 at Belmont for service 6 for extra capacity.
1514-17/22-26 used to displace Solos/knackered Tempos on the 56/57/57A/86.