The 50/50 split will:

1. increase ROI for bid bot owners
2. decrease ROI for bid bot users
3. market mechanisms will correct #1 and#2
4. the current level of bid bot usage will be sustained with less money being pumped around by users.
5. this creates demand for more delegation to bidbots.
6. The dust treshold combined with the new reward curve and the 50/50 reward split create additional demand for bid bots for smaller and new users.
7. the separate down-vote pool creates insentive for current self-upvoters to move from self voting to "savely" delegating to bidbots.

So no, this won't hurt bid bots. Without a few simple fixes, that should be implemented with the EIP, not some distant HF in the future, the EIP will make the bid bot economy flourish like never before.