I read a long time ago, that such a tower on the east side was a part of the long term stadium design, and may happen some day, but is not currently anything more than a possible option. Seems like I read this in a tribune article years ago, but have not seen anything about it recently.
It would make sense, if we continue to fill the expanded stadium for the next serveral years, but even with all the interest there is currently in football in SLC, the general trend in the West is in the opposite direction.
It will certainly depend on how successful the program is in the coming decade, which among other things will see the end of the Whittingham era and a new head coach.