Having been a Trekkie since the original series, I can still feel the bolt of pain and sorrow that shot through me when the news broke about the sudden, untimely, unimaginably bizarre death of Anton Yelchin. I can only imagine the sadness of those, like you, who knew him, worked with him and loved him.
I've read your statements about the fate of Chekov in the next Star Trek movie, and I understand your not wanting to recast the character. But when the reason you give is Anton deserves better, I have to respectfully disagree.
I believe the best way to honor him and his work is to make sure the character of Checkov continues.
There have been many instances of actors who've played iconic characters extraordinarily well, then passed away.
Most recently Heath Ledger comes to mind.
Until Ledger, nobody thought there could ever be another Joker after Jack Nicolson. And until Jared Leto, the idea of someone besides Ledger playing Joker was unthinkable.
Each performance builds on the last. Each honors the prior characterization. And while the original Star Trek members thankfully didn't meet an untimely death, you've already recast them all (brilliantly) in three movies.
Leonard Nimoy passed the mantle to Zachary Quinto, whose extraordinary portrayal of Spock is testament to Nimoy's work in every frame.
Pavel Chekov is an essential part of the Star Trek cannon, an indispensable crew member whose very presence on screen honors Anton's work and memory.
Of course I didn't know Anton. But being a copywriter, creative director and card-carrying member of SAG-AFTRA, I do know actors. I'm certain he didn't work as hard as he did to create his interpretation of Chekov, only to have the character die with him.
I'd ask that for the fans, and for Anton's legacy, you reconsider recasting the role. And in doing so, assuring both Anton and Chekov continue to boldly live on.