Still zero chance. Some other comparisons if it helps. Ridership for the entire NJ Transit system for an entire weekday is 940,000. One million people amounts to 1/5 of the total ridership of the entire New York City subway system for an entire day. (And I don't even know if you split that number roughly in half since many of those people are at least taking two separate trips).
At they're peak, the SCF had 6 million viewers for the entire country. There is no way you are going to get a figure even close to one out of every six people that turned on the television in the entire country to watch the thing in their living room to actually go to a parade in Chicago
And college football is an order of magnitude more popular than the NHL, and the games take place on Saturdays where virtually the entire state is tuning in. If you put the crowd at your average Michigan home game on a flat surface, it would probably look about as big as the pictures of the crowd at the Hawks parade.
Forget the countries ratings. Those ratings were large because of the Chicago market.. I mean about 42% of households in Chicago watched the Hawks win the Cup. That's a huge. Then you take into account other sports fans in Chicago that just want to enjoy a nice day outside with the rest of the city. It's one giant party and an excuse to skip work/school, etc.
For the record, it was estimated at 2 million, so half of that seems reasonable. Look how many rows back the parade rout was too. It's not that short a route.