One thing that the article points out is undeniably true:

Wireless charging consumes more energy than cable charging.

However, going from this fact to "disaster waiting to happen" is quite a leap. Granted, any small change at a large scale could cause big issues. Yet, the estimate reported in the article is using the current energy output and wireless charging pad design to gauge the potential impact of wireless charging for all phones many years into the future. This estimation, in my opinion, is invalid, because it doesn't take into account the improvement in wireless charging technology, the increase in power plant efficiency, and the continuous growth in electricity production via renewable energy source. It is highly possible that as the adoption of wireless charging increases, so will the energy production efficiency, so much so that the improvement in energy production outweighs the increase in energy consumption via wireless charging.

Hence, while the point that wireless charging consumes more energy than cable charging stands, I don't think it will cause a disaster in the future, from a pure energy consumption point of view.