Well, according to my calculation, the e/c stuff will be going on exactly 3 years a few epis before S8 finale (counting from the time Calleigh kissed his cheek which officially started the "will they won't they" crap) -- 3 freaking years is long enough -- wrap it up & close this 3 year arc....that's what I say.
As far as the recent news, I honestly don't know because it seems to boil down to whatever is going on with Adam, & unfortunatly we have no clue.
All I can say is that I don't really see any writing out for him this far.
Adam keeps saying he still wants to be there, Emily says this might be her last season, Jesse look authortive in my opinion & also looks to be taking over second-in-command position -- so personally I could see Calleigh leaving before I could Eric....especially since the poor dear will face freaking death for the gazillionth time.
Really I have no idea, but my thoughts on Eric investigating the team makes me think that this is just a little test to see where he stands - with the team or against them - and I could honestly see this little investigation causing him to A. quit the DA thing, or B. make him realize he wants to re-join the team. Either way, I see it as TPTB's way of leaving that door open to either him leaving for good, or returning full time.
My thoughts on Calleigh are that she's at a stand-still & has nothing left in the pot. If this life or death crap pushes her to leave Miami & the lab, then so be it, I'd jump for joy. While I can see TPTB still emphasize Eric's relationship with Horatio & the job (especially this season), I don't see the same with Calleigh - TPTB have seemingly cut all ties with her & everyone else on that team.
Overall, I'm wondering if this decision will actually be one of them having to decide to choose the team/job, or the relationship....one of them wanting to go, while the other will want to stay...who knows, that's just my thoughts right now at the moment.
Honestly I just want the show to move on one way or another -- I've had it up to my neck with E/C's soap opera -- it's done ran it's course.