I think people will just undelegate from bidbots and start selling their votes instead.
People are two things - greedy and lazy - and an increase in curation rewards meaning delegating isn't the profitable way, being really the optimized way to earn selling their votes, so they earn the vote selling fee plus the added curation,
Ah man the vote selling could get crazy
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Bidbots can just increase the returns from delegations to compensate for the curation rewards increase. I expect bots to be more profitable than ever as a result of HF21. No rational user will flag them either, since both the semi-exponential rewards curve will apply to flags, and the increase in 25% of the VP for flagging will dramatically increase the harm retaliation threatens from such hugely staked accounts.