Nationwide Conference chief executive John Moules says it is unlikely Margate will be allowed to ground-share with Dover for a further year.
Gate have asked to extend the agreement for up to another 12 months while Hartsdown Park is redeveloped.
The Conference board met Margate officials, Thanet Council and developers about their future plans.
A decision on which league they will play in next year will have to be made before the Conference's AGM on 5 June.
If Hartsdown Park is not upgraded to Conference standards, Gate may have to pursue a 10-year ground-share option to maintain their Conference status.
Leigh RMI would earn a reprieve if Margate are relegated.