(So, I just sent an non-proof-read version of most of this directly to a self-identified straight person - I'm obviously not going to say who - who wants, not just Zero/Gideon, but the whole relationship of Zude, to be written off of the show instead of recasting the one character, because they're a shipper, and they don't think that it'll be the same with out Adam, and they're right, it won't, but I think that the entire fandom should read why that's the lesser argument)
Further disclaimer: Previously in the conversation, this individual seem oblivious as to why they and I are not equal authorities on the subject, and I couldn’t see it as any thing other than ignorance/unbeknownst arrogance.
As a fan of a character, I would think that you would want those whom share a rarely-genuinely-seen-in-the-media intimate part of that character's identity to have representation, and in as many displays as possible. Zero/Gideon's existence on screen represents the potential successes a bisexual person can achieve in a way that no other character I've ever seen has. The fact that some one who doesn't know the plight of being bisexual, let alone any kind of queer, is trying to excuse scrapping the presence of a successful-to-the-point-of-fame, well-written, bisexual who's in a loving relationship with some one of the same sex, and also is successful and kind-of in the public eye, just because the character's (straight) actor can't remain in the role is a major insult to all of us whom would take offense, because we have met the certain struggles that come from being bisexual, and continue to strive for success.
No, it won’t be the same with out Adam, but it could be even better if they have to recast Zero/Gideon (*cough* Wade Briggs *cough*). This has nothing to do with Adam (I love Adam!) and every thing to do with necessary progressive representation.