User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-4694695-20130828165613/@comment-6646546-20130828175200

Because Capcom don't have unlimited budget, time, manpower etc to create super duper new MH.

Rather than creating new engine, mechanic, CGI and AI, Capcom could spend all their budget to create dozen new monster model and reuse 3rd gen engine and asset. But then fans will scream "Capcom, stop being lazy!"