For Venom to appear, Eddie Brock needs to be in at least one of more of the previous films. There needs to be a series of catastrophic personal events show for which Eddie can blame Spider-man. Without an extended history, we'll have a rehash of Raimi's pathetic Blowpher Venom, even if the new actor actually looks like a man instead of a teenager. In other words, Eddie needs a few years in the timeline to descend to the level insanity that is necessary.
Imagine Venom's redemption...it's easy, if you try. No monotone delivery...from that silly Blowpher guy. Imagine strength and madness...it's frightening and cool. You can say I'm a dreamer...but I'm not the only one.