I don't think having bigger lans with bigger prize pools is going to help things, I'd rather see a heavier focus on making leagues a lot more healthy which will in turn spawn more regular high quality content, help teams stick together for longer and give newer teams and players more motivation to improve.
I feel just having another LAN will mean that the hype will just surround the event and just die out afterwards leading to teams disbanding and going their separate ways.
Not only that but I feel that for TF2 to actually do this anyway, I'd love to see a scale back on production efforts, I know that it's what we pride ourselves in but I feel this will lead to putting too much effort into a scene that may not bare fruits at the end of it. This I feel is leading to this whole shitty "we can't justify putting all this time into it and not get anything back". If we focus instead just putting on a quality and modest show we'd put less pressure on certain individuals and we can then make sure that the load is separated so that we don't overburden select individuals.
I can't speak for everyone else but I'd like to see more regular cups and shorter leagues take place online, for EU especially ETF2L is becoming such a stagnant place that I feel it's a large contributor to players not wanting to play anymore.