One indicator for it would be the growing academic activity, that we documented in this paper. The field of corporate/strategic Foresight has been growing from from about 20 in top journals in the 80s to about 80 in the 2000s and it is still growing.
For future research directions you can also have a look at the second reference.
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Conference Paper Environmental scanning, futures research, strategic foresigh...
Article Corporate Foresight: An Emerging Field with a Rich Tradition