I can see why the show would put Zak and Lisa back together. They've been together for 20 years, through good and bad times. A big part of her identity is in him, and vice/verse. Steve Halliwell said people always come up to him asking when Lisa and Zak will get back together. The problem is the story with Joanie just wrecked Zak and I don't know how you can come back. I've seen some fans say she has gotten over it too easily and looks like a mug, and I tend to agree, but what can you do? I know what I'd do - I'd keep them apart, but I think the average viewer does want them back together.
I think Paddy can still work as a comedy supporting character, and with Aaron, even with Chas, but I don't want him with Rhona again. I have never liked that relationship. And I don't want him to "save" her from Pierce. Let her save herself. Or have Vanessa do it. I don't want some story where his affair is forgotten and forgiven because at least he's not a rapist.
I think the show is riding the wave and when it's done they will cut the cord.