Since the Internet2 infrastructure first came online in 1998, the topology has relatively consistently had 9-12 "routers". With the recent consolidation of the layer-2 and layer-3 infrastructure onto the current Juniper boxes, all 40+ nodes in the network now have routing functionality. Through discussions with network connectors, there is a consensus that it makes sense to to allow "local peering" at each node when requested.
At the same time, during the discussion, the community acknowledged that changes that are likely to come with the next generation of infrastructure will once again consolidate the network into fewer nodes that may redistribute access points and require another set of changes that will reduce the number of peering points. If your connector organization is interested in taking advantage of local peering, please contact the Internet2 NOC at email@example.com.