I think you're mistaking cooperation for competition LaRue. Bing maps and HERE maps/drive are NOT competing products. The apps themselves are pretty much irrelevant. What matters is the geographic data they use, which is what MS pays HERE licensing royalties for.
If MS ever starts collecting their own maps data, like Google does, and stops paying HERE, then we can talk of competition. That's just very unlikely to happen... a.k.a. just not happening.
I also think the poster above is correct. Everyone I've heard from, including Nokia employees, say HERE is no longer focusing on WP development. Someone needs to pick up the slack, which nobody but MS can do. Furthermore, there is a lot of redundancy between MS' and HERE's mapping apps. Cutting down on that SORT of redundancy was one of the big reasons MS bought Nokia's D&S division in the first place. Finally, as the person above mentions, the mapping experience on WP is very fragmented and in dire need of work. There is no way MS isn't aware of that.
I think it's a given that one or two of these apps will eventually go away or become irrelevant, after their functionality/features are assimilated by one of MS' own apps. The only question is when...