It depends on how the Saudi Arabia tournament affects things. There's so much prize money on offer, and presumably ranking points, that future number ones won't be so reliant on the world championship.
As it stands unless Tump beats the crucible curse (
) , it seems unlikely that he'll hold on to the top spot next year.
Trump doesn't need to win the WC again in order to remain WN1, which by the way, is bucking meaningless.
I can guarantee you that almost all top pros would rather be world champions 1 time rather than being WN1 for a few years.
In order for him to retain that top spot, he just needs to go deep in the big paycheck events, not necessarily to win them.