I've seen similar comments re: the pedestrian mews being lacklustre or under-utilized, and I think it's mistaken personally.
Only a small fraction of the people that will live in the area are currently there (wait until Sugar Wharf 1 + 2, One Yonge, Quay House, Lakeside open, along with the redevelopment of Loblaws) and only a small fraction of the people that will work in area are currently there (wait until Waterfront Innovation Centre, One Yonge, LCBO open, let alone all the George Brown and Universite de l'Ontario Francais students). So it's no surprise the foot traffic seems low.
On top of that consider the fact that several of the spots in the mews haven't even been opened until now (and of those that have, haven't even set up proper patios).
Once the above is all dealt with, I'm willing to bet that the mews becomes very popular.
(And for the record I think the mews could have been done better, but I still feel the need to defend it because I don't want pedestrian mews being discouraged - the only other thing that this strip would have become is just another street, an extension of Harbour Street to be precise, which would have been infinitely worse than even the worst pedestrian mews.)