Burial or cremation?

Yes I think you are both correct.
Not the same need in future to excavate old sites and no space for new burials.

My DF died and was buried in Singapore. 50 years later we got news that the cemetery was to be redeveloped for housing and roads.

I had to arrange for his body to be disinterred and cremated. It was the strangest thing. I went out there with my siblings and we mourned our loss together.

If we were all to be buried wouldn’t we run out of space? All those plots with headstones. I think some graveyards are full. Didn’t the King via his Privy Council allow the body of a 7y old boy to be buried in a graveyard next to his primary school after it had been ‘closed’ for 100 years?

I suppose they won’t have the same need or desire to dig bones up to try to find out about the people they once were, since there will (presumably) be plenty of written/archived records about recent eras.