The craziness is over thankfully.
There aren't people walking there because there's no reason for them to. The place where you'll see a lot of people walking is the beach facing side of the jumeirah beach residence (those ugly towers) where there are a lot of shops, etc. A strange thing is that sometimes that area is completely packed, other times totally empty.
Just by looking at the amount of lights on I'm actually surprised at how many are occupied (and of course, you never see all lights on in a residential tower), you can't tell from people on the street. Dubai Marina will stay occupied because it's one of the best areas. If people leave then prices will go down and people will move to the marina from worse areas. I'd worry more about Sharjah here.
Also if people do the math they'll find out 10 supertall res towers isn't all that much, for office space yes it would be but not for residential. These are also really skinny and not slabs so say on average we have 8 two-bed apartments per floor and an average of 80 residential floors (remember, average total floors is higher). For 10 towers we then have a maximum population of 12800 people. Not a lot is it?
I can post more pictures of people walking around in the marina if you want.