By Nick Selbe The Rams, who are off to a disappointing 3-4 start, have an aging core of key players who might not stick around for the long term. At 3-4, the Rams are off to their worst start in the Sean McVay era. How long McVay sticks around to guide the team back toward its usual winning ways could be determined by the longevity of several of the team’s core players. Speaking as a guest on The Rich Eisen Show on Tuesday, Sports Illustrated‘s Albert Breer was asked about the Rams’ lack of moves before Tuesday’s trade deadline. Breer pointed toward the team’s four primary veteran stars—Aaron …