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I think that the last part of m41 gave us a clue of what's coming: tyranids, the first 3 hives were just the tip of the iceberg, I believe they were just scouting the galaxy (detecting weaknesses, measuring strengths, adapting and evolving for the real attacking force) I believe there are bigger hives out there and I know they haven't given up in fact they haven't even begun. It seems that the Tau empire is in their path and even though they have spread across the galaxy very rapidly and posses advanced technology they lack the warrior spirit needed to fend off an enemy like that so along with a lot of human worlds they would be wiped out (of course not completely). Since the whole galaxy and all of its living creatures would be at risk a coalition of all the powers of the galaxy would have to be made which would be very interesting to see can you imagine, the boyz fighting along a kill-team, chaos and loyalists astartes joining together to repel the endless swarms, even the eldar joining... well maybe I got carried away but the point is it would be an interesting scenario for m42
It's indeed true that the Nids are they biggest treath the galaxy is facing, but the imperium and the other races just cannot cooperate together. Fisrt off, if it's true that orks respect force and that there leader need to be strong he also need an orkish green skin. Saying nothing except an ork can lead orks (tought humans do hire them sometimes, but are usually betrayed when the time is right). Second of all, if it's true that the Nids are the biggest treath, has suggest the Cain Saga in the book For the greater good, the Nids aren't a unified nation, but rather competiting hives fleets that figth for the survival of there own hive fleet. So you could say that it might not be a necessity to figth the Nids has a whole, but rather one hive at a time (witch is still a formidable task). The only nations with witch the imperium migth consider to ally with are the necrons,because they hate the eldars,the eldar when they need to figth chaos, and the Tau, but only when it's considered necessary to fend off a Nids invasion. Such an heteroclit force could hardly coordinate for sometimes century (considering how war a fougth in the vast imperium of man) and infigthing would ensue quickly. especially if you take into consideration the profound racism that affect the way of thinking of both the humans and the eldars (they call humans Mon-keigh) toward anything else you got a lot of problems on your sleeves. Also, some of the xenos migth consider there inclusion into a coalition a submission to the humans who would still be the main military force figthing against the Nids, unless you include the orks, but has I said before it's seems hard to achieve on the long run.
Finally, you would need a general even more competent then macharius himself to lead such an impresive army and maintaining cohesion between old days ennemy and a lot of cooperatives generals or cast fire soldiers. It would also mean that this decision would question ideologies that have led for better or worse societies (human and Xenos alike) for thousands of years. So if i'm not dismissing your idea witch I found quite interesting, I would like to remember you the fact that taking such meaures would change completely the wole political structure of these many nations we've met since the beginning of w40k.