According to a report in recode, twitter may consider selling the business to one of the companies that are often mentioned in such circumstances, including Google, Apple, and even one of Rupert Murdoch's businesses.
I thought that Twitter were going to increase the character limit. Anyway, I think that Google would like to buy Twitter, but would like to see the price fall before committing to any deal. It is just too expensive at the moment. Whether they can solve Twitter's problems....I don't know.