I had similar feeling. When the core set come out it was a blast, I loved it. But after each other supplement the game become more and more broken. Too many cards, to much space needed to play, some new mechanics ta\hta look like they where made just to be made, many actions that are useless becouse players are roleplaying them and don't need for those cards. The game at this point has to much stuff not used durning a session or even not used by any player or GM.
One of the biggest mistakes wher the Guides and Vaults and the idea of Lite version. The Lite version is one big misunderstanding. I don't know any player that whants to rewrite half on the book of his hero sheet.
I don't know if FFG will make a new edition but the game needs to be fixed. If they don't know how or can't do it then it's time for a new edition.
Looking at DH 2e I see a better game that is far more thought then DH 1e. It has many great, in my opinion, ideas that make players excited durning the game. It give players many option and If FFg ever will do WFRP 4e then let it be a game like DH2e. Everything you need is in one core book. Every game ends at some point so maybe it time for WFRP 3e to end or evolve? Maybe GenCon will bring some anwsers.
Cheers
PS. Don't get me wrong but I really hope to see WFRP evolve to a next edition.