Until they announce a PvZ GW 3, I wouldn't worry too much about it. It quite literally takes MILLIONS of coins to even get all of the characters, then there's the process of leveling them up. If you're a completionist it's going to take a lean year + to get all of the apparel.
I'd like to see more DLC since it'd breathe more life into the game. I'd love to see them introduce a variety of variants (Like an Electric Soldier... or dang it an Electric imp or something. Just an automatic Electro shooter for Zombies that ISN'T super Brainz) I'd especially like to see some of the old levels from GW1 brought back, those were really fun. (I loved the Town-setting for all of the levels. And that Golf Course...!!)
As far as I know and from what I've read, there is no intention whatsoever to breathe new life into the game. However, they -ARE- still releasing updates to balance the game out. There's always a chance... always that slim slim chance.
