> > some analysts and critics of the network are concerned that Bitcoin won’t use enough energy to remain secure in the future when it relies mostly on transaction fees. I don’t view that as a primary concern either

> Strangely no reason given for this wishful thinking that declining rewards leading to declining security won't be a long term problem.

Why would reliance on mostly transaction fees be a problem? Even with zero block reward, miners still have every incentive as before (with high block rewards) to compete for finding as many blocks as possible, because the creator of a block can choose transactions and gets the resulting fees. The chance to succeed is proportional to hashing power and thus energy usage. Do I get something wrong here?