Gregg Rosenthal thinks that the Bills, by cutting Trent Edwards, show that this team's head office and coaching staff as a whole has no plan for the future.
OR... and this scenario might confuse you Rosenthal because it actually requires thinking... The Bills had a plan: Edwards. And after the first two games they realized that their plan miserably failed (see Bills vs Dolphins and Bills VS Packers), so the decided to not wait any longer to go to plan B: Ryan Fitzpatrick.
Now here's where Gregg probably doesn't have the necessary intelligence to keep up. Fitzpatrick did more in one game against the Pats than Edwards did in his last season and a half as a Bill. The Bills coaching staff realized that with Fitzy as their starter they at least have a chance to win games. Therefor they decided to keep Fitzy as the starter and dump a QB that they no longer needed: Edwards.
The Bills had a plan, it failed. They just realized that it failed early in the season and decided to move on and not look back.