What profit incentive do people have to run a relay? Most people are not going to pay for relays. You have to know what a relay is and does to even begin considering paying for one. Most people are not going to do that. You can advertise on a client (useless because people will just use a different...

I think small, niche, community relays and small special use case relays will be the backbone of the decentralization. For this, relay software has to get a lot easier for anyone to run with with very little technical expertise.