"16% of plan sponsors whose plans are unbundled indicate an intention to bundle some or all of their DB services in the next 12 to 24 months, while an impressive 48% of plan sponsors who are not fully bundled indicate they would be open to bundling their retirement plans if convinced of the benefits.... [M]any semi-bundled sponsors agree that time and resource savings and lower administrative fees are likely outcomes of bundling. However, along with unbundled sponsors, they are unwilling to sacrifice investment flexibility to achieve these outcomes."