Don't worry though, your domain expertise will remain very important. Just like how... uh... having a strong linguistics background is essential in natural language processing (formerly computational linguistics)...
Anyway, "most science will be CS", just like "most companies will be tech cos", is a prediction you should take seriously, but not literally. It means that CS proficiency will soon be indispensable to staying relevant as a scientist: most what you will do will require CS.
In the same way that "most cos will be tech cos" means that tech proficiency will be essential to staying in business: most of your operations will critically require tech. Walmart, AXA, FedEx, etc. are "tech companies".
It doesn't mean that chemistry will be literally classified as a subfield of CS, or that Walmart will be literally classified as a tech company. Obviously...
But it does mean that, if you were a business executive in 2000, you should hire people who understand tech (including at top levels), and if you're a scientist today, you should make sure that you develop your CS chops (including ML).
You can follow @fchollet.
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