I think Worthing establishing themselves in the NS would be a huge achievement for them. Quite a few sides get regular 1000+ crowds, it would be a great level for another Sussex side to be in. Can always dream about moving up, but reckon the NS is perfect for them right now.
Many sides hit the buffers at National South / North. Getting out of either of those is really tough. Quite a few sides rise up the pyramid, but you start to get a new level of professionalism in the 6th tier.
Well, they have sailed far too close to the wind in the past to merit having any certainty they won't fold. A lot will depend on those contracts, accumulated debts - it's not like they have a great track record of being prudently run.