Wine devs do not want to work with people who have looked at ReactOS[0] (see at the end) so any collaboration is one-way (or by ignoring the guidelines) and the likelihood of the two projects merging is zero.
Surprised no one responded to the 7th comment in that linked email thread, the author brought up a good point about making progress without using any disassembled windows binaries.
Very different projects so I would not encourage a merge but sharing a code base? I can totally see that being a boon for both and other Windows emulation projects.
