But there's absolutely no chance of it happening, and not inevitable in the slightest. Tyron isn't even a character in the game. And even if you mean Tyler, he has no significance in the future - we know this because he's not in the favourite character poll. I think L&P may even directly say it, as he did with Bennett and Neil.
Ellie (two "e"s), already has a reason to dump Logan - Jules kicks his arse in the kissing and foreplay department. It's only that Ellie is coming to grips with her sexuality that she hasn't gone further with Jules.
I agree that Tyler and Logan are on the way out (Sophia certainly does not need Tyler or have a connection with him). I believe that Ellie and Julia have a connection that Logan and any of Ellie's previous boyfriends can't complete with. I think that Sophia could discover a nice strap on in Ellie's room the same way she discovered Ellie's vibrator. This could certainly 'open things up' (had to pun it!) between Ellie, Sophia and Julia in future events. Sophia's first real threesome could actually be with Ellie and Julia, especially if Julia helps Ellie realize her fantasies with Sophia.
I also think that there is room in the story for Ellie and Dylan to at least try each other out (physically, not as romantic love interests). This isn't necessarily something they both seek out, though. If Ellie, who can be a bit jealous of the experiences others enjoy with Sophia, stumbles upon Sophia and Dylan and she and Dylan have made peace in their relationship, something special could happen. Let's say Ellie stumbles upon Sophia and Dylan and decides to spy. She overhears the conversation about this being their first time together, she watches, playing the voyeur. As things become hotter and hotter between Sophia and Dylan, Ellie gets really excited and she realizes that she wants to be a part of this experience. She also accepts that she'd never feel safer exploring being with another woman and a guy than she would with Sophia and... yes... Dylan. Is it a leap right now - YES. But think how far Sophia and Ellie have come in 19 days (playable day 12). Think of how far Sophia and Dylan have come in the same time. I'm talking about events at playable day 25 or later. I don't believe that we will be Forced to take this path but I do believe that L&P has a story with enough variation in choice to give us the chance to pursue this type of encounter.