We passed 20000 block. Reward for PoS seems to be reduced already
Yup, gains are down, way down. oh well 25% yearly is still very nice, but unsustainably high...
Well that's why the reward drops over time in relation to overall tokens created in existance. At 50B PoS will begin only paying fees (a year out from mineout the snippet will be added making this permanent). So no need to worry about that.

whats the point of having expected staking time anyways... mine keeps changing from 149 days down to 5 days then back to 149... never been lower then 5 days yet
Well if you have 100,000 you won't be getting much right now as many higher ~100,000,000 are probably staking it right now.
Sorry that's just the way PoS works.
There are ways to buffer this but then only penalizes those who do not do the work to still work around any kind of PoS restriction coded in.