Yeah, the area near where TRON will be going is going to need to be shortened.While I think DL's iteration has always been better, it's also important to remember that MK's speedway has lost 32% of its length over the years as more rides were added in around it. And from what I can tell, it's going to need to be slightly shortened again to make way for an entrance path to Tron via Tomorrowland. Poor thing just can't catch a break.
At the same time though, Autopia at DL feels like it's very natural and like you're driving through forests at times. WDW's has never really felt anything like that.