A team approach with differentiated duties, works well, with teaching important for all. There must be balance at the unit level, but individual's balance can be flexible. Some accrediting agencies have specific and quantitative publication requirements while others ask only for qualitative demonstration. I can show you examples, but they are not all alike. For tenure decisions, the strongest focus is on teaching, with evidence of engagement in the discipline and future productivity.
Excellence requires an expectation of continuous improvement.
We need to recognize special situations, e.g. labs. FT faculty members are near the minimum for accreditation in some programs. We also need to be concerned with 12-month programs. One way to address that is with variable contracts having different periods of commitment during the year. There are a variety of types of renewable-term appointments.