I would. Those are actually legitimate concerns.
The scout was correct when expressing concerns as to whether or not Hill can provide the instant, off-the-bench, production that Ginobili has. The scout was dead-on because remember, even if Hill is successful at creating offense for himself, he's not shown the ability to create offense for others.
The scout is also correct about Hill's handles - they're not great nor are his defensive abilities, which, as we saw versus PHX, have been greatly overrated.
The SF position was also cited as a position of vulnerability. Even if RJ has a better second year for the team, the backup SF position is weak. Simmons, Gee, and perhaps Anderson will all have to combine for solid contributions, on both ends of the court, for this NOT to be an area of weakness. Pop and R.C. have expressed concerns about the backup SF position, so we know that's not a secret.
As far as the starting center position is concerned, Blair will provide a consistent, high-energy, rebounder and scorer along the frontline. It's on the defensive end, where he must demonstrate improvement. Even still, he's not going to get any taller - meaning the Spurs could be rendered vulnerable against the taller frontlines (Fakers, Mavs, Blazers). That's is where Splitter should come in handy. The scout was was correct in referring to that as a concern.