What could happen if majority of hashrate 51%+ would drop SegWit support and switch back to non SegWit old BTC nodes?

Could this create a problem? Do old node miners still exist on BTC chain?

submitted by /u/walerikus
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source https://www.reddit.com/r/btc/comments/rbym0t/what_could_happen_if_majority_of_hashrate_51/

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