The main motivation behind Servicenodes is to

1) Create incentives for people to run Full Nodes

2) Help miners get more rewards

There are infinite proposals of how this should be approached. As you say "everybody's guess is as good as mine".
But realistic scientific (and decentralized) solutions for this will be rare and in danger of being fragile.

I'm working on an anti-fragile solution.

https://en.wikipedia.org/wiki/Antifragility