There are economies of scale for SSDs. Thus if there is more demand, you can afford to build out the costly infrastructure to create the SSDs at a lower cost because of the volume.
Expect that a significant percentage of the HDD market to never shift back from SSDs even after the factories come on line.
The problem as described has a long enough timeframe that I expect to see production shifted out of Thailand -- or at least away from low-lying areas. (Production facilities are, as I understand it, deliberately relatively disposable, these days. Were I responsible, I would not risk a repeat -- especially in light of news and predictions regarding climate change. I would also want to start rebuilding capacity now or as soon as possible, as opposed to in X months.)
A subsequent question may be, then, will this shift be of existing, mechanical drive production, or to some significant degree into SSD's?
I don't know about the ownership of parent companies and the remaining value in existing equipment -- and time to restore it -- vs. new capital investment, to make a specific prediction. The Thais also provide some skilled labor; unfortunately (for them), I don't see that -- in my pure, relatively uninformed guestimate -- as predominating in decisions that are made.
