"What should motivate academic faculty members to work as a team?" -- You ask.
It is likely that there is much that motivate academic faculty members to work as a team.
To have a common purpose or goal to achieve, for example, to become one of the best universities all over the world, can motivate academic faculty members to work as a team.
The main motivation for joining a team is to easier and quicker achieve defined goals... for example in conducting some research and writing a papers, books, monographs, etc.
Long term team work can be benefitial for each member participating. It can be a way of both getting better knowledge of each others research qualities, but also building a cluster of knowledge between faculty colleagues. Anthony Baidoo
The ability of other researchers to solve a part of research problems can motivate faculty members to work as a team. so that in some cases the ability of some persons to publish a paper in a journal can motivate researchers to include him or her in their teams, especially in countries with low international and ISI research journals!
Only by working as a team is it possible to tackle research projects of a certain size. In many cases, the major research topics are of a multiplidisciplinary nature, which will require the participation of researchers from various areas, in which case, without a collaborative approach to research, it is not possible to undertake this task.