They really need to bring some value back to the past cards. It's pretty shameful now how you can only be effective in the matches if you have Rebellion cards. They have effective said that they don't care about the investment people have made from the beginning. I still enjoy playing brawls though.
The problem I think came with trying to make the early investors too happy in the past, and it made a large divide to get in and compete, especially since those early investors are also those running bots, collecting all the reward cards, dumping on the market etc. Not all of the early investors of course :)
A game from the start should encourage one account with more than words.