Models are easy when you turn every cow into a sphere. But physicists never believe their models respect the real world. Computer Science should be about the Science of Computers, not hypothetical models acting on hypothetical architectures.
Not in its current form, and not if you define "computers" with a sufficiently broad net.
(Or broad loom, tipping a hat to Jacquard... )
No, various bits and pieces of it did, but not the whole, coherent field, which is motivated by the existence of computers.