The City of Calgary needs to acquire like 1 foot of right of way from pretty much every property along Centre St to make things work for the Green Line. It's one of the reasons costs for that stretch is so high. Property owners could get some easy cash and give the City the bit of their property that it needs or they could dig their heels in and demand the City expropriate their entire property to get that 1 ft. The cost and time associated with possibly expropriating hundreds of properties and then trying to sell them back on the market is a big complicating factor with Centre St.
That being said, even with all the added BS around the Centre St alignment, I am a firm believer that it is the only way to go. The original Nose Creek Valley alignment by-passed a huge chunk of population and will hopefully be one day served by commuter rail anyways. The biggest failure of our current LRT network is that it is essentially park and ride focused commuter rail which is great for 9-5 rush hour commuters but sucks for developing all day, 2 way traffic. Sunnyside station and 45th Avenue station are really the only two spots on the entire network that are in the heart of any community and are designed around walk-ability. The fact we have such limited examples of community stations on such a large LRT network should be seen as a planning failure in my mind and yet it is the same vision Grey and McKendrick's group have been pushing for the Green Line.