Kauffman Stadium is just fine where it is.
It's fun to visit other cities to watch baseball. I haven't been to new Busch, but went to old Busch many times. I've been to Wrigley and The Cell in Chicago, Metrodome in Minnesota (it seriously blows for baseball) haven't been to Target Field yet. Been to Camden Yards, Old Yankee Stadium, Old Candlestick Park. I'd like to go to Fenway.