Yes, but IE has a history of being the slowest, most insecure, least standards-compliant browser, so if I'm trying to get people onto a "good browser treadmill,

Yes, but IE has a history of being the slowest, most insecure, least standards-compliant browser, so if I'm trying to get people onto a "good browser treadmill," I'm going to steer clear of it. If IE becomes the dominant Awesome, Fast, Safe Browser for 5 years running, I'll reconsider.