Thats a weird argument. "Lets not give the medicine that might help as that might also encourage mutations." --> basically you are saying let's deny it to the many dying today in order to ensure the few (that can afford it) can still use it in the future. A deeply immoral and selfish perspective if spelled out this way.

The only solution then is rapid and large-scale intervention. Massive use of the most effective/least side-effect variety of drug for all at risk populations for 3(?) months, then bring in the alternatives and quickly and widely ensure their use in those areas where resistant strains still spread.