I think it's time UT considered building a new softball stadium comparable to other stadiums in the SEC. Sherri Parker Lee stadium is starting to look outdated and showing the old age of it's design. As stated, it's location between a railroad yard and a wastewater treatment plant is most undesirable. The odor from the plant sometimes is stifling not to mention the noise of the trains passing by. UT would do well to consider building an expanded stadium on UT's land on Alcoa Highway near the Cherokee Farms. A stadium in a natural setting with outfield berms like LSU, Arkansas and Missouri have would be the way to go and would make the fan experience more desirable. As stated, SPL stadium is behind the times and may even be hurting recruiting.
UT was in the good position of building a new stadium when they were to take advantage of a building boom and kept momentum going. The bad side of that is that more than half the schools in the SEC have built stadiums since SPL opened, and they were able to add what they liked about it and improve on it. So while SPL is only 12 years old, it's way behind some of the new ones built since then. It's still well ahead of a few, though.
I get a chance to see every facility at least once every three years, and I would rate us solidly in the middle of the pack. Texas A&M lapped everybody with by far the nicest stadium that's been built for softball ever. Not even close. I'd rate Arkansas second, then it's a pretty good drop to Missouri, Kentucky, LSU and South Carolina (although USC's 2014 stadium hasn't been well-maintained). From there, it's Alabama, Mississippi State and Tennessee. Florida spent a lot of money for a stadium that I just don't think is that much of an upgrade from what they had. The home locker room and coaches' offices are nice, but the seating area an press box are meh and the hitting facility wasn't touched. Georgia, Auburn and Ole Miss are WAY behind and none of the three have current plans to build something. As it stands, I don't believe those three are even eligible to host the SEC Tournament.
The locker room, team room, film room and training room at SPL are all fine and meet needs. The indoor cages are fine. But all of it could be much better.
As for the seating area/press box, the unfortunate thing we discovered when we did a press box remodel in 2014/15 was that the stadium itself is VERY well-built. Meaning, the bones of the stadium are solid enough that any major renovation would take basically bulldozing the place and starting over. The big problem is parking. Including the lot on the far side of the warehouses, there is only enough parking on-site to accommodate about 2,100 fans. So any increase in capacity from where we are today will require either a park-and-ride from the ag campus, construction of a small garage, or some kind of pedestrian walkway across the railroad tracks.
Regardless, the stadium is where it is and wouldn't move. The Cherokee Farm campus is not available for anything other than expanded research facilities. The golf practice facility over there is the extent of what athletics would be allowed to do.
All of that said, I think you'll see some pretty significant upgrades to the stadium done in the next 2-3 years. Especially if baseball gets major upgrades of its own.