I kind of think that Oliver and Felicity are going to be their own team for a little while. I think he's going to come back to town because of Thea (from the interviews today, it seems more like it's going to be a LP side-effect thing rather than them needing help with a big bad), and he's going to be perfectly happy not getting into the fray. Felicity's going to be itching to get back into it, and I think she's going to find that D/T/L have already found someone to take her place on their team. Something's going to happen that gets Oliver back in a suit, and I think they'll be two teams working in tandem for a while until DD and HIVE become a major factor, and (hopefully, because I'm mean like that), the team finds out that the guy they brought in for tech support is a HIVE operative, so Felicity has to take his place. Seems like there's going to be some conflict there for a bit. I feel like the new team will need to make some kind of miscalculation (like by bringing in someone that works for the enemy) in order for Oliver to be able to come in and, not take charge, necessarily, but become a leader with them again. IDK.