It doesn’t need to go away to make later better than now (from a COVID perspective, obviously there are logistical implications for Disney for stopping the train).
There is a lot of room between now and never. Opening something like Disney, one of the biggest tourist draws in the country (and keeping the other parks open), in a hot spot while cases are high is a lot different than opening it during a downward trend that happens in hopefully the not too distant future. Why the heck did they wait until mid July if opening like this was fine? Waiting on the reservation system?