If we assume this is a proper plan, then the area they are talking about is on the edge of Kenilworth and there are some very expensive properties in that area, the owners of which aren't going to accept some potentially big hits on property prices by having 20k football fans milling around every other week.
Not to mention the small roads around that area which tend to get gridlocked at rush hour, so will get gridlocked at match times as well.
I found it amusing how some of the CCFC fans are claiming HS2 being nearby helps show great transport links, only issue being the closest HS2 station is in Birmingham. LOL