Last year at i46, the grand finals were on stage but there was no "isolation" between the teams. A lot of other big lan events have the two teams play in a box with a glass window.

This would be nice so that the casters have the ability to actually call out certain plays that the other team is not yet aware of. Will they be doing this for i49 or will it be a similar setup to i46?

make sure you're useing the correct directory. I think after steam pipe was released they changed where all you're local files were stored.
now it's Steam\steamapps\common\Team Fortress 2\tf\cfg
I think it used to be Steam\steamapps\USERNAME\team fortress 2\tf\cfg

you can also find the proper directory by clicking "browse local files" in the "local files" tab in tf2 properties.

So today is saturday. Some people suggested that there should be some sort of casted match between respectable players using the pick/ban system.

Will this be happening?

Another idea that I'd suggest is a "surrender" option similar to that in LoL. Where if the majority of a team can vote to just end the pug if it's a roll. I think this could help with ragequits.

Also, if someone rage quits, don't let them add up to another pug until the one they quit from is over. But give the option to rejoin that same pug if it was an unexpected crash.