This question is somewhat broad, but this place seems like the best place to ask. I have been accepted for an information assurance program, but I am a computer science major and my main interest lies in software development. Should that deter me from deciding to study information assurance?
Another factor in the decision is that the program is through scholarships for service, so it is a 2 year program with 2 years of work in a government position for information assurance. Ultimately, I recognize it is a subjective decision. The core question I am trying to ask is, should you do graduate study even if you are only partially interested in the subject matter? In other words: how committed do you need to be to the subject matter for graduate study to be worthwhile?
On another note, we continually see news about huge networks with cybersecurity issues. Sony's Playstation network, LinkedIn, and I think I read today that Yahoo! accounts may have been compromised. With the growth of businesses and services online, it seems only natural that an adept skill-set in information assurance would be beneficial.
Some people do further study because they are interested, indeed passionate about the topic matter. Others do it to improve their job prospects/career outlook/ultimate pay packet.
Ask yourself which category you fall into. If you are not interested, then you may not enjoy it and may not succeed unless your motivation is more financial.