How much time to you spend defending good, solid punches? If it's not at least once a week, you may find yourself wetting your pants the first time you get hit with one. If you're still concious. You're assuming you control the clinch. And if there isn't room to run, there might not be the room to complete the takedown. You've been in crowded bars before, right? Shoulder-to-shoulder, there's barely enough room to walk. If guys stumble, they grab whatever's close to them, including other people or countertops or what have you. I've tried to take guys down in a confined area before, it changes things. The risk of be being taken down isn't one I take lightly. That's why I train in things like wrestling, judo, CSW, and BJJ. Crosstraining shines through. You're unable to defend it with reason? Let's assume I'm really, really slow. Why would you want to spend a minute or so fighting a guy when an accurate, powerful punch can end things instantly?