It is unlikely that Tsvangirai has the power to keep his promise. He only entered the "Unity Government", with Zimbabwean President "Robert Mugabe", after being thrawted, and defeated by SADC,(Southern African Development Community), a regional body: in which South Africa, and it's ruling party: the ANC (African National Congress): has great influence. Tsvangirai had repeatedly accused SADC, and South Africa's mediation: of being in support of Mugabe. Mugabe still has ample control over state resources, due to the agreement "reached" by his Zanu PF, and the MDC, at a SADC mediation. Mugabe, suspiciously, it appears, from his actions: is able, as proved by actions in the earlier days of the unity government: to use state resources in intimidation, and human rights abuses.
It is likely that Tsvangirai joined the "Unity Government", in Zimbabwe, in order to gain aid, however the International community, will still not recognize what it considers to still likely be a form of dictatorship, or government sustained by the will of a few, even if Morgan Tsvangirai in some token manner, or in some amazement: has an office in government. The Catholic church in Zimbabwe, also: like the Southern African Catholic Bishops Conference: desires for Mugabe to be removed from power, from documents which have been released, this is ascertained to be so: by us (on the last time we were updated, by the SACBC: properly on the issue, unless we missed something, which seems highly unlikely).
Thousands of Zimbabweans have died from a cholora epidemic, due to a lack of clean water. Many others have fled to South Africa, where they face Xenaphobia against "Up North" (Other States in Africa), and other issues.