Even if Twitter changed their API rules tomorrow, what developer is going trust Twitter to make their living building a third-party client?
The damage is done. If Twitter reversed their mistake six months after the API change, then it may have blown over, but years later, I would be surprised if any developer saw Twitter as a viable platform to spend their time on. It still amazes me that with all of Twitter’s bad leadership and questionable decisions, they’ve still grown to become a successful company.
I’m a bit more optimistic than Joe, but this is a concern that I failed to mention when I linked to Evan Williams’ comments last week. Developers will certainly be hesitant, but I think those that jump in could find success and other developers will be quick to follow.