The Eagles now have Darren Sproles to throw into the mix. So McCoy isn't the lone wolf there, though obviously he'll still get a ton of the carries. I could see Sproles getting a lot of work on 3rd down, though. I don't think McCoy repeats his 365 touches from last year, which were almost 50 higher than his previous career best. There is also the 300-carry rule, where 75% of the guys who get over 300 carries score fewer points the next season and 50% fall off by 50 or more points.
I could also trade him instead of just throwing him back. I'd try to trade him for a slightly lesser player at a lower keeper cost (I may try to get Zac Stacy, he's on a roster with no other star players and is a $5 keeper) or perhaps just auction budget.
I love McCoy, so I'm certainly not decided on moving on. And even at $48, he's got value since the top few picks usually go for $55-60.