I truly wanted to move to ExtJS 4. Having MVC is a great improvement, but itself alone shouldn't be the only reason to move. I believe they should have focused more on the ease of migrating from 3 to 4 which didn't happened, like it happened from 2 to 3.
At this point, there's no real value in migrating and paying to have ExtJS 4 running in our clients.
It's a pity, specially because I start having the feeling we're getting surpassed in technology. It's a very fast pacing industry, so if one doesn't keep up, it's competition will get the hang of it.
Definitely having a ticket system like JIRA or so helps a lot. The bugs shouldn't be in the forum. Also having the transparency to keep up to deadlines should be implemented. If I have a delay of 4 months to a client of mine, I'm out of the business, as simple as that.