Since 6.x-2.x is planned to be totally gutted and rewritten to work with the heavily changed VersionControl API 2.x branch, there is the possibility that some users that are currently using the 1.x branch of VC Project may not have a clean upgrade path. Usage stats are pretty low for this module, and a good portion of that is probably test sites, etc but it's really hard to tell. Given that this module and VC API itself never made it past the rc stage in the 1.x branch, I'm not sure where that leaves us in terms of support and it's hard to tell whether the few users that did use this were actually using it in production.