Sandys was indeed following in other's footsteps. Aubrey Jones was the architect of the industry's rationalisation policy, indeed Macmillan planned that both men would work in tandem in the Ministry of Defence and the Ministry of Supply to attack the problem of the high price of defence procurement. Eventually Macmillan felt Jones was too "nice, sincere, shy – not fitted for the rough and tumble of politics and industry," so he replaced him with Sandys as Minister of Aviation, but by then Jones' policies were already bearing fruit.
Let's not forget Sandys' earlier stint as Minister of Supply during 1950-54 lacks much of his later zeal for cutting state support, indeed during his tenure the government spent £106 million on capital facilities for the industry and some aircraft companies had received state-owned capital equal to, or greater than, their private capital.
Rationalisation goes back even further, the Minister of Supply George Strauss suggested trimming the industry to thirteen companies as production units and issuing only three or four operational requirements a year to sustain nine or ten design teams as far back as June 1950. It could be argued had the Korean War rearmament programme not appeared with all its conequences for the economy and military procurement that the industry would already have shrunk by 1957.
Sandys wasn't picked because of his ideas, he was picked by Macmillian to see the job through whatever the obstacles and he had the experience of the political background for the better part of two decades which probably made him more suitable than other possible hatchet men to get the job done. Looking back from today its hard to say he did anything dreadful or that subsequent history would have been any different.