User blog comment:Tierhalibelbrylle/RWBY X Red vs Blue/@comment-24631732-20140529092055/@comment-3146930-20140529204927

For me, it is more of an animation issue. RvB is based on the Halo games, so everything in those videos (for the most part) is using a realistic backdrop. RWBY on the other hand is built from the ground up and looks much more like a cartoon. The problem is that these styles are so different, there is only one real way to do it. Because you can't really have Halo-versions of the RWBY characters, the RvB characters would have to have RWBY-versions made for them. The major problem is just the plot; I can't think of a good reason to have these two groups meet without it feeling very forced and it would also have to be important to both story lines.

I'm not hating on the idea, just that the idea itself would be incredibly hard to pull off and feel satisfying by the end credits.