Reports have indicated that FlashForward actually stands a decent chance of coming back next season as well. For one thing, it's an ABC Studios production, which means it's much cheaper for ABC to keep on the air than a show from another production company.

But the biggest factor appears to be its popularity overseas. While the series shed approximately 40% of its viewers over the course of its initial run in the US, it remains one of the more popular exports for ABC. That strength, which means revenue, might be enough for ABC to give it a second try.
http://www.cinemablend.com/televisio...wal-23163.html

Auch wenn die erste Hälfte der ersten Staffel ziemliche Qualitätsschwankungen hatte, würde ich FF doch eher eine Fortsetzung gönnen als z.B. Heroes, dass nun schon seit drei Staffeln seiner früheren Form hinterherläuft.