I advocate for the following:

• interest is a consensus variable which can be defended by everyone, not only delegates with proxy capability
• impose strict window for lifetime interest from 2% to 10% the change of which require HF

Would love to see such mechanism in Steem and also transfer it to Golos. I already had an idea to incentivize long term commitment a bit more flexible depending on period of investment. Also IMHO capability for lifetime interest create a starting point for UBI which is awesome. I am going to put 1/5 of my SP to lifetime saving account if that option will be available.