A potential matchup between Brock Lesnar and Fedor Emelianenko right now would be 100 times as exciting as ANY boxing matchup I could possibly think of. Even if you don't pay attention to either sport, the appeal of an MMA event has overtaken the appeal of a boxing event.
take this weekend for instance, professional fights Wed night, Friday night and now tonight (that is 30-35 fights). Boxing had about 3 professional bouts this week. Overall UFC has a major card once per month as do the other two major divisions. Each card has 8-15 fights. I won't even get into all of the local events that occur across the country every weekend.
I'm huge boxing fan but the first MMA fight I saw was chuck and randy 1 and I was hooked. I now fight mma
Oh and yes I am now a much bigger fan of MMA then boxing I've seen every UFC fight sense UFC 1 even the prelims on the ufc website!