How each person should approach this is variable. As
@ChiefD correctly eluded to about me a long time ago - I like involving myself in the process. No matter what is actually happening I am going to be doing some form of training. Sure, some sort of short term objective to work towards is necessary, but I am always going to be doing something. Whenever my mid-May race gets cancelled I'll use the information available to me at that time to make the best possible decision then audible my plan with that target in mind. I know new information later may change that plan too - but I'm gonna keep going anyway and adjusting as change occurs.
That isn't the case with others though. Without that carrot dangling out in front others are more likely to skip a workout, then two, then the domino effect. I can't wrap my head around that sorta mindset - I've tried, but I can't. I just know that it exists. I think those that are susceptible to that must self assess now and game plan accordingly. I don't know what that game plan is, but I am confident ignoring it will have negative consequences later.