Hard to make a choice considering the circumstances. First off, unless something has changed that I'm not aware of, Neverland itself is not completely owned by the Jackson estate at this time. Doesn't Colony Capital still have like a 50% ownership of the land? That would have to be worked out and/or paid off for it to be free and clear to be done with as the children/estate deem appropriate.
Second, except for the empty house and some buildings, lake, etc., virtually nothing is the same as it was when Michael still lived there. As several others have said, there are no rides, no animals, the entire atmosphere is no longer what it once was. To return it to anything that resembled the Neverland that Michael so loved would take enormous funds, upkeep, etc.
About all I could envision at this point is some type of restructuring for charitable organizations and/or events, perhaps even some sort of animal sanctuary, but how that would be done should have direct input from the heirs obviously, and hopefully without more posturing by some of the usual family interlopers.
As for it opening for the general public to "tour", except for maybe a very limited number of times per year, I just can't see that happening. It is not the Neverland of our memories any longer, the things that made Neverland what it was to Michael are no longer there. Maybe the Giving Tree and a few other things, but not the heart and soul and his visions.
And as has been talked about before, the surrounding area ie roads, property, access, etc., is truly not condusive to any large scale memorial/tourist attraction. You would actually have to experience the limited access to understand the obstacles that exist and would be incredibly difficult to work around, and with respect for the other neighboring land owners legitimate concerns.
jmo