To think, for example freedom or fyrst will turn into curators because you raised the curation is actually the shortsighted view.

Nobody thinks that AFAIK. The realistic goal and more likely outcome is that they delegate to someone or some type of service which takes curation more into account (and that if they don't they will be penalized with lower rewards and less ability to milk the reward pool).

Do you think people will downvote more?

Yes I do, but how much is a question.

No they wont. Fear of retaliation will still be there.

Right now there is fear of retaliation, and in addition a system which makes the downvote cost about as much to the downvoter as it takes away from the upvoter. This is goofy, insane, and it should be no great mystery why there are almost NO downvotes (supposedly something like 0.01% to 0.1%), even by stakeholders who don't post and don't care about retaliation.

When the cost of downvotes is reduced, there will still be the fear of retaliation, but not the enormous cost, so there will be some increase in downvotes. We'll have to see whether it is enough to do the job.