My goal is to use sliding-scale voting so we can boost these variables up/down slowly over time.
Adding more witnesses dilutes the block rewards and makes it harder for them to maintain their services. This is especially true given the volatile nature of crypto. We want our top witnesses to be well funded. At the end of the day it may work out that it becomes impossible for a single person to be a witness and all the top pain block producers will be businesses that build on Hive and bring the most value in.