How many PPG will the offense Score?

[JoeRedskin]

I was reading the most recent Keim article:

What the Washington Redskins' O must produce to get to the playoffs - ESPN

Based on his research, it looks like a team needs to average about 22-24 PPG to be a serious playoff contender.

I can see this offense making 21 PPG on average. Not sure it will have the oomph this year to get over the hump. In my opinion, ST and Def contribute to the offense's PPG through TO's and field position. While I think the offense has the weapons to do score >21 PPG, I also think the defense and ST have to provide assistance and I am simply not convinced they can do so. If the offense is consistently put in a position of needing long drives to score, I just don't see it succeeding. Again, not b/c it can't score on long drives but just that doing so consistently is very difficult.

So ... I see an offense that scores 21 PPG. Anyone else think higher or lower? Does 21 PPG get us into the playoffs?