Are you criticising Bill Wadge in particular? His Ph. D thesis led to one of the widely studied notions in descriptive set theory [1]. He switched to computer science and made a lot of contributions to CS and AI [2]
If you are talking about disrupting academia in general, I am partly with you. There are academic have-beens, but the "disruption" might be tantamount to throwing the baby out with the bath water. I don't know of any decent way of distinguishing an academic who is currently stuck while trying to make progress, from an academic who is truly academically dead.
[1] https://en.wikipedia.org/wiki/Wadge_hierarchy
[2] https://en.wikipedia.org/wiki/Lucid_(programming_language)