I don't see there being enough incentive for either party to make a move until the last year of the contract.
It's only an issue for the Nats when there is a roster squeeze from the time the roster has to be set for Rule 5 until the date on which Stras can be put on the 60-day IL. I don't think the last guy to be added to the 40 man at the risk of being lost to another team under the terms of rule 5 is much of an incentive. We haven't had a guy taken and lost in rule 5 since . . . ? and, if we need to sign someone now, there's a lot of releasable guys currently on the 40 man. If there's little roster incentive, then it comes down to cash flow management.
Stras doesn't need to take a discount. End of story.