I did a Google search and looked at the floor plan for the Temple. I was surprised at how small it is. The floor area of the Temple is about 15,000 sq. feet, in comparison to the SLC Temple of over 250,000 sq. feet. The San Diego Temple is over 70,000 sq. feet. The Redlands Temple, which is a few miles from where I live is just over 17,000 sq. feet and is a small Temple by LDS standards.
In looking at the Kirtland Temple design and purpose narrative, it was not designed for actual Temple ordinances. It is three stories. The first story is for services and worship...basically a chapel, but with a pulpit at each end. From what I gather the pews can be used in both directions.
The 2nd story also has pews and was used for the school of the prophets.
The 3rd story, at least half of it was used for high school during the day, and for quorum meetings at night...the other half was Joseph's office.
What I am getting at, because the Temple is on the historic register, it is simply not even close to having enough sq. footage to serve as a full service temple and still keep it's historic nature. It does not even have a baptismal font.
If the church were to remove the pews, build walls and corridors, etc. It would no longer be historical. I just can't see it happen, nor would I doubt that the church would ruin the original design and fabric of the Temple.
Also if the CoC has done previous restoration and seismic upgrades, and received government monies such as tax credits, then there is absolutely no way this could happen.
My guess is that they will restore the Temple in its original condition. And it will be a flagship for the church in regards to Temple PR.
Also, if you do a google map search you can see there is plenty of room for a full service Temple nearby. Also if you look at the visitor center's parking lot condition and roof...the Temple may need the same TLC, which show the CoC just does not have the means to give the building what it deserves in regard to restoration and preservation.
https://www.youtube.com/watch?v=w7KLlPPw33M