I'm going to give a somewhat contrarian- but futuristic- take on the RB situation:
I don't think anyone's bolting to the portal.
Why? Take a look at the fungibility of RBs at the next level. RBs who were "that dude" for 2-3 years come up for a new K and they get the vet's minimum. One year, two year max.
You have to be historically extraordinary to do better.
There is value in simultaneously being showcased enough for a variety of scouting film, while also preserving the tread on one's tires. The position is also prone to both traumatic and stress/overuse injury (e.g., Chaney and Citizen) and aggravation.
Dawson's offense gives a multiplicity of looks and usage. If you get an RB 40-50 touches over a season, I'd argue he's in a better draft position due to enough film, while keeping the mileage down.