Considering both Monster Hunter teams have been busy with other titles over the past few years, who would have made this game though? Monster Hunter World releasing in 2014-2015 would have meant sacrificing at least one of the 3DS games, if not more. The timing wouldn't really add up either, considering Monster Hunter 4 came out in late 2013.
MHX wasn't made by the MH4/4U team, so why would that be sacrificed (and if they hadn't wasted time making XX, they could have been helping on finishing MHW)? Pull resources from elsewhere for assets, programming, and so on.
MH4U came out years ago and was a half-step entry as well.
I see no altruism, I see a product arriving late in a cycle's lifetime. That isn't when you help a market, that's when you ask the market for mercy or favor regardless of conditions.