I'm sure they did it to launch their version of the Born Again storyline for season 3. Then, when Matt will rebuilt his life, Nelson and Murdock will reopen. As for Karen, on the other hand, I don't know. She will probably continue her reporter job. Wouldn't mind if, when rebuilt, Nelson and Murdock engage a new secretary... Would love to see Becky Blake
With Karen, it's a tough call. I'd love to see her come back to her old job because the image of Matt, Karen and Foggy as a kicking ass law trio under one roof is very iconic and I would give anything to see it again. It is hard to imagine the office without her, and no one could match Karen in being the glue that holds the office together.
But on the other hand, the reporter job feels like it was tailor-made for someone as inquisitive as Karen. She says as much at the diner in the beginning of
The Defenders that working at the Bulletin feels like what shes meant to be doing. Investigative journalism is something Karen has a talent for, and where that takes her career is more interesting than having her stay Matt and Foggy's secretary. And there's possibly more mileage to be gained when you don't have all three lead protagonists working under one roof and within ten feet of each other. So
Daredevil hopefully will utilize Karen's strengths in journalism rather than backpedal her career to fit a status quo.
But the trio of Nelson, Murdock & Page working together is an iconic dynamic in the show, so hopefully *Daredevil* will find a new way for Karen to constantly be around Matt and Foggy, and helping them with cases as she comes into her own to fill Ben Urich's shoes.
There's also the fact that Karen is firmly established within the narrative to be Matt's main love interest. It would actually be a bit of an issue for Karen to come back to Nelson & Murdock if she's dating Matt, because of the imbalance of two co-workers dating in a three-person law firm. Besides Matt is more moral and righteous than Jeri Hogarth.
On a related note, Charlie Cox has said on the Con circuit over the last year that the lessons Matt learns in
The Defenders will carry over into
Daredevil season 3, and two that hopefully stick are A) that he finally realizes that it's wrong to unnecessarily withhold important information from those he cares about and make unilateral decisions without their input, so he needs to be open and honest with Karen and Foggy, and B) he finally realizes that he only makes things worse by isolating himself from the people who know and love him.