Really? Are you sure about that or are you just using these forums as a representation of that?
While Madden may have lost fans they have also gained fans as well as many people agree that it's the first Madden that's better than Madden 2005 overall. I have some people on my friends list that still play Madden 10 even though games like MW2 are "what's hot". Also, if people were cool with playing other sports titles so much then why didn't other sports titles make the LIVE activity list outside of Madden and FIFA? I remember hearing that NBA 2k10 had a 60% sales increase from 2k9. The 360 version of NBA 2k9 made the top of the sales charts this time last year. NBA 2k10 sold 60% more than that yet it wasn't shown in the LIVE activity top 10 chart for this month.
Is it really Madden on the decline or is it just sports gaming as a whole due to shooters gaining more and more buzz?