BVRAAM,
The "sense" is that unless those aircraft are replaced, there will be a significant capability gap. Only a fraction of the 100/736 task is DACT; much of it is in providing specialist training to maritime and army units - ie JFAC / Thursday War training. They already cannot cope with demand, and elements are contracted out to civil companies operating surrogate aircraft through a number of somewhat ad hoc arrangements. If 100/736 and Cobham 2020 are not replaced by ASDOT then something will need to be purchased by MoD or a de-scoped "ASDOT-lite" will need to be worked up - quickly. Assumptions about Hawk T1 airframe life will have been made, no doubt, with ASDOT as a key factor. Buying a second batch of T2s is good industrially for the UK (one reason why, as taxpayers, we should support it), and another, say, 40 or so jets should be enough to re-equip 100/736 and RAFAT (again, showcasing the current jet for potential exports) - probably leaving a small number that could be used to surge MFTS if required (assuming they can get enough RAF QFIs to stay or enough civvies to move to Valley). That would leave a small, specialised, Gen 4 / 4.5 DACT task which could be re-competed at a later date with T1 Typhoons filling the gap.