I just realized that you meant, do we get Pettigrew for blocking BECAUSE we might lose Peters.
I think that is an interesting argument. One that I'll ignore, however, on the basis that we need a Tight End regardless of Peters' status for the upcoming season. If you think about it, Derek Fine looked like a solid #2 TE. What bothers me, is that over the past years we've brought in TE's that were starters on other teams (ie Gaines and Courtney Anderson) and someone made the call that Robert Royal was better. Anderson didn't make the team, which might mean it was a lack of effort, or he's just not that good...to which I respond, ANYONE is better than Robert Royal (but that's an argument for another day)
Without totally sidestepping your question, there is no way you could explain to me how the Bills can start this next season without addressing the position in the draft or FA. With Peters gone, you can't act as thought you need TE support to supplement his loss, otherwise you got to keep him if you think he's so pivotal that you're entire protection packages change without him there. I don't think that's the case, which is why the Bills MUST address the TE position regardless.