Similar to the end goal of the Firmament Restoration was for a new housing district, The IS end goal should be a personal house.
But one of the major flaws is that the IS has been an unengaging spreadsheet that, with the exception of the first week of release to set things up, requires nothing more than a brief weekly visit. It's set it then forget it until next week and You can even go longer without visiting by setting up two weeks worth of orders from the Mammet Sweatshop since you'll still end up at the same place compared to someone who visits their Island multiple times a week for the sake of optimization and getting the rewards as fast as possible.

Should the IS end with an update to give us a personal House? Yes.
Will they actually do it? Who knows
Are there other, smaller updates they could do in the mean time to make the Tataru's Gil Prin...I mean our Personal Haven more appealing until that possibility actually happens? Absolutely
But without something huge to top off the Island after so much dev resources went into an Island that has little to no engagement, it's going to feel like a waste.