All the items from inside and around the house was moved before the events of 2007-2008 when he was still the sole owner. So, that really does not prove anything.
As for why the rides were removed, I think it had more to do with the fact it was cheaper to store that stuff than to keep paying people to keep it up. Also, his people were not paying his bills which is why he got in trouble to begin with.
I did read articles that clearly stated that Michael was still the majority holder with Colony Capital holding some stake. Which is why no one can legally do anything with Neverland without the estate's approval. So, Jermaine or the family has no say what happens to Neverland.
On topic, the reason why Michael never sold Neverland has more to do with it money value over any feelings Michael had over it. Neverland is a piece of property that is worth millions and Michael most likely saw it like all his investments and didn't want to sell it. What he had plan for it, we will never know. Also, he most likely kept it to keep other people from buying it and making money off of it in his name.
However, I think fans wishing for another Graceland is very wishful thinking. It is not in a good location for heavy traffic and unlike Graceland, Michael is not bury there. Also, the 'magic' was lost the minute those cops raided the place. Michael felt it and that is why he left. Any attempt to recreate it is doom to failure.
Most likely, Neverland will sit there until the kids come of age and they can decide what to do with it.