Your logic doesn't work. You're assuming a 9-mile radius circle instead of a 2.9-mile one. The M1 line is three miles straight. The DPM is three miles in a circle, but it's really only 1-mile across at its widest point.
Your logic is way off as well.
Let's go with your point about "density" [[aka population) first. According to city-data.com, the residential population of the Downtown neighborhood [[which includes Bricktown & the CBD) is 4,359. Generous estimates by the Brookings Institute place it at 6,500. See here for downtown population data.
The populations of those living within a half-mile of the proposed M1 Rail line, which would include some parts of the populations of New Center, MIdtown, Brush Park, Art Center, and Med Center, is conservatively 25,355. Remember, this is residential only.
Add the roughly 80,500+ people that work Downtown you have roughly 86,000 people that could potentially use the People Mover. M1 Rail, on the other hand, can tap into the additional 20,965 New Center employees, 12,000 Med Center employees, 2,500 Wayne State employees, and 31,786 WSU students, and suddenly the M1 can serve from 141,320-173,000 people conservatively compared to the DPM's 86,000.
Then you have to factor in the 5,600,000 visitors to the CBD every year for events at Cobo, Fox Theater, Stadiums, etc. But wait--this doesn't include the DIA's 532,273 visitors per year.
So you can see where I'm going with this. Extending the line up Woodward invites hundreds of thousands more potential users to the line than the DPM.
Regarding suburbanites that come downtown... "won't take the train... would rather just drive," etc. Look at it this way. A Birmingham family comes downtown for a daytime ball game and spends $10 on parking. They leave the stadium hungry, and staring them in the face is the the M1 rail. Suddenly the world is open to them. They can leave the car, safe in the garage, hop on the rail, get out at Atlas or Union Street, grab a burger along Woodward for a change of scenery... shoot, if they're early enough they can even grab a show at DFT or browse the museum -- all without having to gather the kids, cram them in the car, leave the garage, navigate Detroit's confusing streets northwards, pay for parking again when you get to your destination, etc. To me this seems like a very appealing option. People in other cities do it all the time. Why not here? I would wager that suburbanites are much more willing to sacrifice a few extra minutes during their destination-to-destination commute for some added comfort & relaxation. Who do you know that actually enjoys driving, especially in Detroit? People would much rather people driven around, or grab a ride--or, in this case, hop on a train.
Finally, I would wager that suburbanites are not the real target audience here, and if anything they make up a small percentage of the anticipated riders. It's everyday residents, downtown workers, and visitors who want to come to Detroit without renting a car--these people will use the line most frequently.
The final point is one of simple aesthetics & practicality. The DPM failed because it rather slowly circumnavigates an area that is easily traversable by foot [[the CBD is one mile across). This is simply not comparable to the M1 line, which covers a distance far greater than is feasible on foot.
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