I did not suggest to burn it. They could have bought years ago a ram fab and ensure their supply will not dry up.

Now their sales will go down as a result of the failed planning. But more importantly lost once in a lifetime opportunity to corner the entire personal computer market

They could have, yes. But that's not really in their DNA and mostly an observation with the benefit of hindsight. Apple aren't a hardware manufacturer. Designer, yes. But the making has always been outsourced AFAIK.