Unfortunately, Civic Space is essentially an ASU 'quad' now that they own and have SunCard-protected all of the surrounding real estate. I also think something like The Pin would be out of scale for the size of the park and clash with the condom sculpture.
I was always 'for' the pin. I am sure I have said this, but I think Symphony Hall needs to be knocked down and rebuilt on the Chase garage site to allow for the CC expansion to be contiguous. A new 'icon' observation tower would then be built into the new lobby at the terminus of the Adams Street 'activation corridor.' I don't care what shape the top takes, but think it would be silly not to have the elevators lit up in a way that didn't make it look like a Phoenix rising each time to the very top.
The Hyatt and its garage would also be demo'd; the hotel replaced by a dual-concept Hyatt Regency and Hyatt House (underground parking), and the garage replaced with a new History museum, iPic theater, and the existing Latino cultural space on floors 2-4 over retail, and office space on top of the western portion. A sky-bridge would connect the museums and theater to the lobby of the 'pin' and to the Hyatt restaurant/bar space, doubling as space to watch events held on Adams.
/dream. Because... just, because... here is what I was thinking: