David Os (superstar tutor) no longer like twitter. Fact. He dislikes the fact that people tweet everything and that some use it as a semi-im client.
I think that although these are valid points, it misses out on twitters overall core strategy. Twitter has become an ecosystem. It is slow developing (when compared against other social networks) and its growth is based on its users. Thus these annoyances are a key factor in twitters expansion. I can see a serious market for adding image posts at some point in the future, and I have ideas on how they could implement it, but it wont happen anytime soon in my opinion.
The real question is which search engine will be the first to put a bid in for it?