Although I believe in maybe allowing a president to have three terms instead of two, or maybe six years of presidency, I definitely believe there needs to be some limit on how long someone can stay in office. If there were no terms a horrible president could stay in office a really long time. No good!
Presidential terms are an important aspec of the government which provides protection against the abuse of a dictator. Even if a president is able to gain enough support of the country to keep being re-elected, it is important to give others a fair chance. Having one person in power for an extended period of time can reap disastrous consequences.