I agree that, they can't end the series with BLADE:Trinity. For one thing, the ending didn't make sense. And [SPOILER] the vampires didn't die! [/SPOILER] So my opinion they need to make one more movie to end the series. They should try to get Guillermo Del Toro to direct the next BLADE, because he did a great job in BLADE 2.
well, if you go here , you will see that Norrington (the director of Blade I) has turned down the job of directing FVJ2, maybe he will do Blade 4, which would be the perfect way to end a franchise, go back to the original director.
I agree that Norrington would be a great choice to do the final Blade movie. Goyer is a great writer, but he needs to let someone else do the directing. I hope BLADE goes solo in the final movie!