Hard Fork 20 will not eradicate bidbots. This is what it will do:

2018-7-9

HF20 may sharply decrease immediate votes, but:

1. bidbots will earn increased curation rewards
2. The prices of votes will decrease initially, will make bidbots seemingly less profitable initially, because author rewards will drop, which will mean that less direct payment will be initially available to buy votes, but overall, despite a cosmetic change in prices, both bidding and bidbot operation will stay beneficial.
3. Curation will become more beneficial, but will remain inferior to reception of author rewards.
4. Automatic frontrunning will become more common, and will make some authors earn easier than they did before, on a relative basis.
5. My life will become easier, since I will not have to upvote my threads and comments ASAP.

Will probably update this thread by editions if my comprehension of HF20 will grow.