Honestly, at some point they will need to build a new stadium. There are only so many ways to modify the stadium to give a better fan experience. How many times have they done that already?
One reporter actually said the new stadium isn't off the table, but because it's going to take so long they need to do something faster to appease the current team which they expect to contend over the next 4-5 years.
I guess when they reveal what the reno's are next month, we'll get a better idea.