I've got nothing but respect (lot's of it, in fact) for Jimmy Doohan. By all accounts a great guy and significant baddass back in the day. Still, is it really a suicide note when you send it snail-mail to some actor? I mean, how long do you wait for a reply? What if he's filming somewhere? Seems to me like if she's waiting to hear back, pretty much all he's got to do is not tell her to "just do it already" and the problem pretty much solves itself.
I'd still consider it a fine thing since it was obviously quite meaningful to them both, but a little overdramatic, honestly.