For Penny's career, I want to see her go back to The Cheesecake Factory.
But not as a waitress.
Just imagine if Leonard and Penny (or the gang) stops there for dinner one evening and the service is abysmal, the wait staff is goofing around, the manager is harried, running around and completely ineffective. With a unique insiders view to how things should be run and better managed, I can just see Penny taking over, issuing orders from her table: to a waiter -- 'The couple at Table 2 asked for tea like ten minutes ago. Until now, I could see that they were enjoying their meal. If you want to salvage any portion of your tip, get it to them now, along with a piece of free cheesecake thrown in.' From her seat at the table, I can really see her like a general approaching D-Day, running the place with great efficiency and planning as she calls out directions and suggestions to the staff. Her talent wouldn't be wasted on the harried manager who hire her for her managerial skills and human insight on the spot.
I've always enjoyed our time at The Cheesecake Factory. We always had a lot of laughs there. TPTB did the humor of the show a great disservice by excising it from the line-up and making Penny a pharmaceutical rep where the only laughs came from the wonderful Stephen Root who was afraid of Bernadette. After that, zero laughs in pharmaceutical sales. The humor could return, if, Penny as a manager, has to manage a group of surly, unqualified wait staff. Like Stuart had with Dale, his incompetent stand-in at the comic book store (loved Dale! Need more Dale!), we could get some of that, Penny overseeing and managing a group of Dales. I think that could bring back some of the missing humor. Not that I want even less time given to the cast but, at those times, when we did visit Penny at work, at least it will be fun and memorable.
And it would serve another purpose. Those in the cast who are not written as geniuses are struggling: Penny and Stuart (Raj's struggling is self-inflicted). The everyday people of ordinary intelligence who bring warmth and street smarts are not succeeding. Maybe Penny could bring her managerial flair to Stuart's store and make it successful and we'd have a happier, more confident Stuart as well as more happier, more vibrant Penny.