Gretna, like ICT before them, gave a firm undertaking to have an SPL compliant; ie, 6,000 covered seats, stadium in place by 31st March.
It looks like they will not and appears that they have made no effort to do so.
If they can demonstrate that they have made some sort of real effort to comply but have been frustrated by some third party such as a local planning authority and simply require more time through little or no fault of their own I believe the SPL should have some sympathy with them.
If on the other hand, as appears from the outside to be the case, they have merely ignored the promise they made to their SPL partners including Caley Thistle then the rules should be applied, whether they finish bottom of the league or not, and they should be excluded from next season's competition with the top team in the first division taking their place.
As Raydale appears to meet the SFL's criteria for First Division grounds there is no reason why they should be demoted any further than the First Dvision.