Hiya! Been reading these boards for a while but only decided to post today so hello! Sorry if I have not got the quoting or replying figured out yet.
Just to weigh in my two cents. The main reason I watch the show is for the family and the mom/kid interactions. I think they do them like no other show I've seen to be honest. The main reason I didn't like Brallie first time round was the huge shift of focus it caused. It was accused by some of becoming "The Brandon and Callie Show" and I could definitely sympathise with that. They tidied it up, maybe a little looser than I'd have liked, but personally I think the show learned from what I would say were mistakes and put forward a really strong 2A. On the back of that I'm not too worried about them revisiting it. Sure, I would rather it was gone for good, but as we ended with the kiss I think, as some have pointed out, there is room for reflection and in some ways it may be good to have a second opportunity for them to revisit this. It could potentially be towards a more conclusive end (my hope) or maybe they will take a different approach. As we have seen growth from both characters and it happened in a characteristic moment of desperation on Callie's part I would like to think that even if it is revisited it will be done in a more mature way than the last time and I think 2A has convinced me enough to trust the writers.
My main issue with most of the pro-Brallie arguments is that even if we move away from the argument that they are not legally siblings and that Callie already has her role within the family, what happens if they break up a few years down the line? Where do loyalties lie? That would be my issue and why in my mind it is an unhealthy relationship. It's not whether Callie is bound to the family by Jude or not, if this is any indication that Brandon and Callie have found it so hard to separate after 3 kisses then facilitating them and encouraging them to have a full blown relationship would be pretty poor guidance as at the end of it Brandon is secure in that family and Callie is not. A messy break up which is an incredibly likely possibility for teen romance would leave poor Callie alienated or at least in an incredibly awkward situation. I'm not saying she'd be kicked out but whether the family intended or not it would likely cause a huge emotional stress. I can't see any parent ever encouraging that possibility, even if just a possibility. I don't buy that you can't push past feelings, especially at 16. The risks outweigh the gain in my mind. You can channel those feelings into another form of a relationship (such as Mike and Stef) and that is much easier to do at early stages. Personally I see a deep connection with Brandon and Callie that could survive beyond a romantic one and I would be much more interested to see that.
If the show chooses to go down the Brallie road then I will accept it. It's TV land and I'm not naive, I know they would try and make it work one way or another but I will find it hard to rationalise with real life - something the show does pretty well on most other storylines so I personally think it would be a shame.
Also, just to comment on the ratings - my interpretation based on the comments from back then was the ratings slide post 16 was not based on the Brallie break up. The pro-Brallie comments were as strong as ever and I saw no indication that people were leaving due to them breaking up. What it seemed people objected to about 16 was that 15 gave hope that Brallie would be over and the show would be moving on and back to the family focus but then episode 16 was still extremely Brandon/Callie centric even if not together and I think a lot of people lost hope. Compounded with dislike of the sperm donor storyline and a feeling that the aftermath was a bit slapdash, you could see the interest from the adult demographic waning. It may have been just the vocal minority but the most common opinion I could see was that it lost its way. 2A however has refocussed back to full family (something that wasn't possible throughout 1B) and maintained steady ratings. I am not stating this as fact, just interpretation and obviously one that is not immune to bias.
Anyhow, sorry for so much. Personally I am extremely optimistic for 2B as I think 2A has been super!