I had these same concerns after the massive drop in turnout between the 2010 and 2011 worlds events.
However, I dont feel like a post on the forums will really have much effect on what FFG does. Many players had previously pointed out both the domination of empire and the strength of HE combo. Honestly people were equally upset at how dominate destruction rush decks were very early in the games history and that issue was resolved through future card releases. It has always appeared to me that FFG tends to sit on balance problems as long as possible to see if future cards can resolve the issues rather that reacting quickly to these kind of situations. In fairness to them they did eventually restrict three empire cards and ban one as well so it isnt as if they never address these issues. If the polish nationals had allowed unlimited Arcane power, they may have had the president they were waiting for to make the change before worlds, I dont know.
I totally support the idea of a European Championship, it seems like that world be a no brainer given the vast difference in popularity between the US and Europe. I havent been able to develop a play group in my area at all and that the small group we had previously has almost entirely moved on to other games. I dont think that the sales are any less than the sales for Cthulu and that game has been around for years, so I am not really worried about the future of the game at least until the current licensing agreement with games workshop is up for renewal.
The biggest issue I see with LCGs is certainly what you have mentioned, once the game has been out for a long time there is a pretty large barrier to entry with no card rotation. I recently went through this experience with AGoT and it was pretty painful ponying up for years worth of LCG product all at once. I dont know if there is really a solution to this issue though. I have also though that some kind of 'precon decks' might be the best solution. I have had several potential players tell me something like "I really just want to play orcs/dwarves/chaos/etc", at least with game of thrones you have the option of buying the single house focused precons to get you started. Something like that, with maybe some additional copies of high use core set cards like burn it down to get a little overlap from current players might be a potential solution. I just cant see FFG producing a x3 version of any of the old battle packs or box sets until they have sold through all of the current product. That is how they have done things with other games like AGoT in the past anyhow.
Anyway, I guess the short version is that I agree with your sentiments.