Thanks this is a good discussion, i am prepared to write a story to compare whether you should put your money to steemit or to put the money to invest the mining rigs. Both are uncertain, but let say if hf19 turns to hf20 because they find the model not sustainable. Then it would be a big risk of not having a job.
Still, the money is nice now :)
You are right, my assumption is that the current reward settings will not change going forward. If they do than everything I wrote in here doesn't work anymore :-)