You make some very valid and exciting points Makid. I think you're right that the skyline is going to grow towards West Temple, the nice thing is is that it's going to continue to grow towards State as well.
Combine the West Temple buildings that you mentioned, with the the proposed and possible locations on State; 151, Harmons, Carl's Jr, Civic Center (that's what I'm calling the parcel south of Questar)
Those additions, even if only W Temple and 151 are built in the next few years and we've got a much wider skyline as viewed from the south, and a much more dense downtown in general.
Because I felt like wasting some time, here's a map of potential high-rises(for this discussion I'm using anything 20+ stories), on corners or next to corners not taking advantage of the corner heights.
Red - high-rise, proposed, mentioned or ready for redevelopment (20+)
Yellow - mid-block high rise potential.
Green - mid-rise(5+ stories) proposed or potential.
Purple - multiple stories already under construction or recently completed.
There are a tremendous amount of sites that I could easily see developed in the next 10 years. Even if all those green mid-rises are only 5 stories, and even if all the red and yellow are only 20 stories, that is a MASSIVE amount of density in our downtown, in Residential, Office and Hotel.
This doesn't even take into account the growth that is going to occur on 4th S, North Temple, Central Ninth, Ball Park, and Granary. I think Sugarhouse is about maxed out, but the S-line has a massive amount of potential as well.
Another area I could see redeveloping is what I like to refer to as Mid-town. The shitty area between 13th S - 17th S & State - Main. It's a natural direction for growth from the Ball Park neighborhood to occur.