I think an extension is extremely unlikely. Having all 3 outfielders locked up to multi-year deals doesn't leave much room for any of the minor leaguers. Nothing is a sure thing with any of the Cubs prospects, but blocking off the entire outfield for the long term would seem to go against the team's whole philosophy of building around cheap, cost-controlled talent. Prior to the Happ extension, resigning Bellinger could have been more realistic, but that was likely an either/or situation.