The Reason I think the May numbers won't change, is simply due to the fact that I don't think KCC would have had enough time to analyse and adjust the numbers significantly in the next couple of weeks, so they would probably go with the previous trends rather than try and do a drastic change. That is not based on any"science", only the fact that bureaucrats tend to kick things in the long grass and not want to deal with an unexpected situation straight away. I may be wrong, but we need to wait and see. They might think that 2 weeks is plenty of time to evaluate the situation.
I don't think the Embassy in Nepal or the other support functions such as medicals and police checks can be up and running until at least July, and it would be very difficult to reschedule interviews at other Embassies, as the transport links are severed.
They also have the option of reserving some visas, like they do for Nicaragua and South America Relief Act (which reserves 5000 out of the original 55,000 DV allocation), and issue those outside of the normal stream allowing RoA to progress and at the same time respecting the rights of the Nepali selctees, but that would require an Act of Congress, or an Executive Order, which is certainly possible. Or even reserve the leftover visas from the NACARA allocation for Nepal, rather than release into the general pool in September.