I don't think that V'ger needs to be involved with the borg at all but it's not so far fetched.
In a vast and possibly infinite universe, it is indeed highly far-fetched that any two given entities with one or two minor similarities would be directly related, especially when there are many clear differences between them.
Heh, yeah I suppose that's true but on a statistical basis I'm sure it stacks up with with the thousands of class M planets with humanoid inhabitants located within a few hundred light years of each other and capable of producing hybrid offspring without genetic engineering.

For all that people criticise it, Stargate Universe seems to have a more 'realistic' approach to habitable planets and the distances between them (albeit Destiny travels much faster than warp drive).