[jeffshek]

The article briefly mentions it - but

1) 19.50 is what the United States has agreed to pay. It's unlikely the same price point other countries can / are willing to afford.

2) Rollout may be harder than expected.

3) If some of the other vaccines work, no certainty of what would be picked.

4) Since the amount of people taking it now grow exponential fold - we may hear of unexpected side effects (hopefully not).