oracle still has a useful product that people want. (not sure why) but because of this they might survive. people would be willing to trade other resources to them for their product. which requires specialized skill and knowledge to produces, and this creates value.
a company like Apple on the other hand is potentially screwed. simply because they hold so much money in the bank all of which would be useless now, so they would lose nearly all their value. the only value they would have is whatever products they currently have in a warehouse, and their manufacturing abilities, which much of that they purchase from other people and don't do in-house. however they would have some intellectual value in their developers.
i don't agree with all you are saying but some of the tech companies would possibly be screwed.
Intel might survive as they still own most of their foundries and their product takes a lot of specialized skill and knowledge to produce.