Samsung's Bada OS might already be totally put to shelf this year. With the astounding successes of both the Android and the IOS, Bada could simply not compete because it was really made for entry-level un-competitive smartphones and the only ones that keep it "alive" are those who bought devices that still run on Bada. Once those people changed devices, there won't other options but to choose either Android or IOS. It was also created to compete against Nokia's Symbian, which is also probably already dead by now.
Currently, Android dominates the low-end market for smartphones and in the coming years, it will be very difficult for new OS entrants to capture the market and upstage either of the two leaders in this industry.
According to Samsung officials, Bada will be merged with Tizen but a Bada handset will not be upgraded to Tizen as this won't be possible. The only option is really to buy a new smartphone and change to a more modern operating system.