It is a shame about max but its not a big deal. The biggest hurdle atm is the fact that SL uses DAE which is a outdated and simply a terrible file format.
No matter what I do it wont input my textures and I haven't figured out how to apply textures ingame. I cant even be sure dae isn't trashing my UV's or not.
Im not sure what your even talking about anymore. Thieves guild? The reason Max is used so widely among companies is that their art pipelines rely on it being used. Rigs, proprietary tools, plugins, scripts etc have been made to work with Max for 20+ years. There's no reason for them to go to other software.
If anything these jack of all trade software's are going out of style and specialized tools are becoming more and more popular. RizomUV, Simlygon, Substance Painter/Designer are to just name a few.
Max/Blender are nearly the same at this point in terms of what it can do. Each has a few niche differences. Mainly with the UI and general controls.
Blender went off and did its own weird thing, while every other software i know except Zbrush has kept with the Autodesk standard.
Another big reason why Blender isn't used in the professional industry is because Autodesk owns the fbx format.
They change it every year so software like blender cant really keep up with them on purpose.
Most engines are made to work with primarily with FBX as its the most standardized format.
It contains all the information you could ever ask for and is compressed alot more that say obj.