That is part of the solution. You're right when you say that the
SAF's ADA capabilities need a huge shot in the arm. The problem has
been examined before on this forum, and I believe the reason it has
lagged is due to funds being used for aircraft, as well as the
capabilities (or lack thereof) of the air forces of our potential
threats in the past few decades. However that is changing, so it is
time to keep up!
However, SAMs lack the mobility to respond to a changing tactical
situation the way aircraft could, which is why I still think
getting a small number of STOVL F-35s, along with upgrading our ADA
capabilities is the answer