Is microfinance the solution to poverty?

No. Microfinance is but one strategy battling an immense problem.
"In the last two decades, substantial progress has been made in developing techniques to deliver financial services to the poor on a sustainable basis. Most donor interventions have concentrated on one of these services, microcredit. For microcredit to be appropriate however, the clients must have the capacity to repay the loan under the terms by which it is provided. Otherwise, clients may not be able to benefit from credit and risk being pushed into debt problems. This sounds obvious, but microcredit is viewed by some as "one size fits all." Instead, microcredit should be carefully evaluated against the alternatives when choosing the most appropriate intervention tool for a specific situation.
Microcredit may be inappropriate where conditions pose severe challenges to standard microcredit methodologies. Populations that are geographically dispersed or nomadic may not be suitable microfinance candidates. Microfinance may not be appropriate for populations with a high incidence of debilitating illnesses (e.g., HIV/AIDS). Dependence on a single economic activity or single agricultural crop, or reliance on barter rather than cash transactions may pose problems. The presence of hyperinflation, or absence of law and order may stress the ability of microfinance to operate. Microcredit is also much more difficult when laws and regulations create significant barriers to the sustainability of microfinance providers (for example, by mandating interest-rate caps