It seems like science needs more experiments and fewer naysayers. No one really knows if this will work, but it's relatively cheap ($23M--a rounding error on the scale most governments work at.)
I get tired of the folks who bash experimental solutions like this (a couple of whom are quoted in this article.) Yes, there is a possibility this will harm marine life. But, unquestionably, the plastic that is already in our oceans is already harming marine life. So we need to try.
This experiment will, if nothing else, provide additional data about what plastic is out there and what methods we can use to clean it up.
I hope the scientific community encourages and funds more of these experiments.