Absolutely nothing in the photos I've seen of the netting and support structure look even remotely permanent to me. Protective temporary measure in my opinion.
That's correct.
Longtime guests of Disney parks see a lot of stuff that looks like it is slapped together, such as birch tree "twigs" used to make the railing around Pooh in DLR, or the 'wooden' railings around Frontierland, such as on Tom Sawyer Island, which look like nothing more than wood clumsily nailed together. The flimsy looking railing around Pooh's queue in DLR is actually sturdier than most of the residential fences the same size, and was built to hold up to millions of guests touching/leaning on it.
This is all an illusion!
If you look closely, all of this railing is built to last, made out of metal and plastic composites and painted. The real wooden railing in certain parks and in the resorts, such as Polynesian, is made to last as well, and doesn't look like the temporary junk around TOL.
The stuff around TOL looks like a poorly done DIY project where somebody spent a weekend trying to built a ramada for their back porch.
What I think the are going to do is construct a scaffolding around the tree, which would probably take a month, and then work on fixing the tree while guests enter Bug's Life. In that case, the netting would also be to protect guests from construction debris in addition to 5 lbs. branches falling off. So, the netting might be in place for about a year, which looks like about how long it would last, if not less.
A refurb might include connecting steel cables on the tops of the big branches to the smaller 5 lbs-20lbs branches so that when one falls off it just dangles, instead of crashing all the way down. The bigger branches are probably structrally sound, but the only way to find out is to do the inspection, which might include x-raying the branches in question to determine if significant corrosion/stress fracturing has occurred.
So, from a safety standpoint, this needs to be fixed ASAP.
It is outrageous if an inspection wasn't done after the first ten years as with new construction, defects/problems usually become apparent in the first ten years . . .