Are you serious ? You get the same benefits that its been bringing for 40 years --- lower cost per IC, lower power & higher performance. Intel keeps doing it for these reasons as do their competitors. And if Intel's competition didn't do it, besides not lowering costs & increasing performance, they would fall further & further behind Intel and lose more & more market share.
Due to growth of product complexity, the process shrink is necessary. However, more efforts should spend on process, IP and EDA tool joint development, especially for 14nm finfet technology. For finfet technology, the layout geometry is changed, more unknown layout dependent effects (LDE) appear. The foundry should find experienced engineers to work on this areas for yield (wafer & parametric yield) improvement.