This is such a fascinating change! I can only cheer for athletes that continue to challenge themselves.
I wonder what this means for the Dutch relay teams though, particularly the women's 4x400m. The schedule at major championships usually doesn't allow 800m runners to run the 4x400m relay, since those events usually overlap. Losing Bol would probably knock the Dutch women out of medal contention entirely.
Not to mention that she'll surely lose some of her raw speed once she starts training middle-distances.