"Those infantrymen specially the tanks would be just sitting ducks in case of enemy's overwhelming quantity of relatively modern Air power".
A solution for this could be to buy a sizeable number of HQ-17AE's from China. "The HQ-17 is designed to keep up with mechanized troops like tank battalions to provide air cover on the move, as well as protect military sites". "The system can effectively intercept not only fixed wing aircraft, armed helicopters, drones, tactical air-to-ground missiles, anti-radiation air-to-ground missiles and subsonic cruise missiles, but also more challenging targets such as stealth aircraft, supersonic cruise missiles and rockets".
HQ-17 - Wikipedia
en.wikipedia.org
I think we should be making this missile ourselves licenced or under TOT in huge numbers considering the vulnerabilities and lack of our modern AD systems. Enemy have got much larger air force with better technology and our air force can't be everywhere due to the sheer task its facing. Our ships and ground forces needs better protection and we are expecting a magic wand from our air force. Resources and our economy is one factor but we are not helping ourselves either by not making ourselves and dependence on others can only go so far.