I feel WotC has addressed some of brawl's issues as a format:
1) Printing cards that are designed specifically for brawl
2) Printing more legendary creatures in a variety of colors (in every set)
3) Printing precons to help
jump start ease of entry.
The main issue, as I see it from my experience, was the mana bases. If you want to play three color decks you need to offer more "dual" lands. Every set should have a common cycle of two-colored lands, in all 10 pairings, to help this issue (they also must not have the same name as lands already in the format, they can be the same card even, just change the names). If you cannot commit 10 slots in common each set to help the format
thrive then get out of the business of the format. I get it will have an effect on limited, but doesn't improved mana help limited as well? The problem comes with trying to
balance standard, limited, and brawl in the same set. Maybe, stop printing some of the pure garbage commons that show up in every set and give them to cards that are brawl playable. WotC is trying, but you either have to be in or out on providing cards for the format each set. We will see.