Right now they ARE planning to fund the extra capability. That is what the whole DWP16 was about. ISR/Networked capability is the core of this and will take a significant lump of the at present $20B earmarked - I have had it mentioned around 25% will go into that space alone. The governments political advantage to the voter is not their only consideration. Stable long term government has significant agenda's other than voters. In particular its external political and national security relationships are now at the fore to a greater degree than for generations. In 2016 a clear majority of voters also no longer swallow the benign strategic environment BS they did 15 years ago - focus groups now report quite the opposite. In 2017 to be weak on national security will more likely turn General Election voters off.I agree with your summing up of the rise in the standing, both politically and with the public of defence in general, but for the politicians to agree to adding a extra capability to defence 10 years down the track is unlikely, unless there is some political advantage to do so.