For sure there will always be those who run infrastructure for love. I believe Hive will never die. I run a witness and my cost for a long time was higher then what I made. Still today I might be only breaking even, so it's not always about the money.

But a node can only take a certain amount traffic, and blocktrades or others running this for love can only take so much. More traffic and less nodes means bad service, and users leaving, or not staying.