I didn’t say it was impossible for the election to go to the House, just that it is not likely to happen. The last time the election got thrown to the House was in 1825.
Also, the scenario that the article is concerned with is not the unlikely event that the election is decided by the House, but the further unlikely event that one of the top three candidates drops dead before the House decides.
You are correct, it would take two unlikely things to happen for the proposed law to become necessary. But if they *did* happen, it would be in everyone’s best interest for the law already to be in place; otherwise, we would have Congress scrambling to deal with the situation in an extremely tense environment in which half the country would be saying that Congress was trying to steal the election.