You think... correctly :D
Although proof-of-brain is kinda silly and misleading.
More like proof-of-friends or proof-of-networking.
Although I'd really like to take it to a whole new level that rewards work for less subjective subsets of value. Crazy things can happen if newcomers can jump into an activity and instantly get paid more because they're doing higher quality work.
There's certainly a lot to make you think on how things operate here, we're still definitely not 'there yet'.
Curation trails are the most obvious way I can think of to reward less subjective value sets.
It's not so difficult to organise those either.
Rewarding delegators is a bit tougher.
Some kind of fusion between Tipu and Curie would be interesting.