I think it pretty much is anyway - there is very little movement now. However, I think that 5 years down the track - or ten - the inflation pool will be significantly smaller also, so it would also limit any potential to grow stake, even if there are author rewards. all other things staying constant like HBD etc (you know what I mean) - when inflation hits 1% a year, there will only be about 6.5M Hive printed in the first year after. Even if 1 account could capture all of it, it wouldn't make a significant difference in the witness voting.
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This is why I've been telling people to look for good witnesses outside of the current top 20 to keep things interesting. I think the lack of changes is mostly due to lack of interest on part of the majority of stakeholders in the matter.
You can bet on it that if someone just outside of the to 20 gets the impression that he or she has a real chance of getting into the top, they will be motivated to start doing interesting things.