As I'm a solo guest I only have to consider what I want, saying that it did occur to me that the cattery may not be open then, but, I'll check closer to the time.
I've decided not to look into cancelling until a week before the final balance is due, which is mid July. As I plan to definitely return to WDW once the borders reopen I'm considering paying the holiday off, but, at the same time checking with Disney where I stand if I am unable to fly in for September and need to reschedule, will they honour the price if I need to rebook at a similar time of year. I certainly don't want to cancel in July and then a week before I'm due to fly out see the borders reopen because I reckon they won't take new reservations for the rest of the year, but, they may allow a rescheduling of dates later on in 2020. Who knows, I'm just speculating. At the end of the day it's all just a case of wait and see, isn't it.