There is a lot of credible evidence but it's third hand at best. With that you are playing the game of telephone, and the facts get blurred just a bit.
Generally accepted is that the yeti doesn't move, and it is because of a structural issue.
We hear, "foundation", but it's unclear if it's the concrete base, or the base of the structure itself.
It's generally accepted as plausible that whatever fix is believed to be a cure, will take more time than they'd like to have the ride closed.
So the arguments I read, is that Disney has cheaped out, and don't want to fix it. OR Disney wants to fix it and has a plan to fix it, but do not want to close the ride long enough to fix it.
So you have to ask yourself what you believe, they have no desire to fix it, or they want to, but the right opportunity hasn't presented itself.
If they have no desire to fix it, I think it's safe to suggest the motivation is a financial one. This financial decision doesn't bode well for the culture of the company.
If you believe they want to fix it, but haven't found the right opportunity. Then the reasons for having not done it yet, are financial, or perceived capacity issues, or guest satisfaction (or any combination). Financial implications in this scenario are not necessarily nefarious. You could be making a financially prudent move.
As to the original posters questions, I do think they will make attempts to fix it. However, my personal opinion is to wait until Spring 2018. My reasoning is that Avatar land should be online. The initial surge in attendance will start to flatten. Hopefully at that time, other opportunities outside AK, will combat that down time. My theory is they look at the coasters as a unit, and only desire to have 1 down at any time for an extended refurb.