Well keep farming to 7* r2d2, he will still be part of the meta in the next 6 months at least. The same goes for Commander Luke Skywalker, the needed toons for him are (farmboy) luke skywalker, old ben, ST Han, princess leia and r2d2, all of them are needed at 7* to unlock CLS.
You have most of them on the way to where they need to be, so here come the crossroads for you, who else will be part of the meta for next 6 months, or 12 months for that matter? You can be sure that jedi training rey will also be part of that meta and bb8 as well, the needed characters for JT rey are (scavenger) rey, finn, bb8, veteran han and veteran chewie, just like with CLS all of them need to be at 7* to unlock JT rey.
My advice is first finish farming the first option (rebels), they are always good in all game modes and arena, fx i still see wedge and biggs teams in top 200 and even in top 100 arena. Not to mention all phases in raids.
Next focus on first order and the toons needed for JT rey, what i see climbing the rankings right now is JT rey (leader), general kenobi, r2d2, bb8 and CLS. The new meta team in my opinion. With regard to KRU, i do not think you should wait for him to be available f2p, keep farming the first order toons that you can farm, even if he were to become f2p soon, you can always use the other FO toons for platoon deploys in territory battles, or as cannon fodder in territory wars.
Then finish farming the second option (empire), they are good for several phases of raids, especially phase 3 HAAT. As for the hard nodes you mentioned, baze and shoretrooper, baze is not critically needed anymore in my opinion, go for shoretrooper instead. The reason people rave about baze is because of him and chirrut together are monsters, but shoretrooper and deathtrooper can fulfill the same synergy as chirrut and baze, one heals and taunts and the other dispells enemy buffs, plus deathtrooper´s deathmark is insane.
This way you can have all toons needed for CLS and JT rey events before the next time we see those events, plus you will have all kinds of toons that help you in arena, galactic war and raids as well as territory battles, after all of these i suggest you focus on toons needed for light and dark side territory battles.
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