I tend to think that you're right, but fans can hope.
Metchie hasn't actually translated so far to the NFL for reasons we can point to, and others we probably cannot. This will probably be his best opportunity to stick and raise his value, obviously because of past chemistry with Young, but I don't think that fans can count on it based upon what he's done so far in the league. It would seem that he would've been given that opportunity in Houston, but they not only drafted one, but two receivers. Tells you how they valued him. Philly didn't blink when they traded him to the Jets who refused to tender him, so no one has really valued what he brings--not really. Moreover, Bryce is in the big boy leagues, now. He doesn't have time for sentimentality when it comes to security blankets. T-Mac and Coker are established. That being said, chemistry can cause explosions under the proper circumstances, but I wouldn't count on Metchie being anything more than a sub-explosion at best.