A quick question about west loop commuter traffic

This question is for people who have a friggin clue about how commuters get around once they get off at Union/Ogilvie Station. A few people have criticized the placement of 300 N LaSalle and the other office tower planned near there because, although close to L stops, they are rather far from the west loop commuter terminals. Just out of curiousity, aren't there several bus routes that whisk west loop commuters towards the east loop, River North, Streeterville, etc? I don't understand the problem..>