Could Sherrod Brown or another non-primary candidate become the nominee in a brokered convention?

Nate Silver is currently ranking "no winner" as the most likely outcome of the primaries. If this happens, do you think it's possible that the convention delegates could select someone who didn't run in the primaries?

I think the last time this happened was in 1968, when Bobby Kennedy was shot and the convention settled on Hubert Humphrey. Do you think something like this is a possibility in 2020? Would it necessarily be a bad thing?