Why start with such a drastic change? Why not cut it in half to start and see if there is a positive effect? Deincentivizing engagement on the platform is not a good way to handle bots.
I think too often with steemit the users are tossed out with the bathwater in an effort to curb bots.
Edit: Here is my full post on the 5 votes https://steemit.com/steemit/@contentjunkie/5-votes-is-not-enough