This is certainly a new low for protest tactics in Toronto, worse than the Palestinian-Israeli shouting match on Bloor Street. I'm afraid that once this protest gets international attention like the one in Bangkok where protesters shut down the city's international airport, every group with a grievance would try to stage something that would disrupt a major infrastructure. For Toronto this could be Pearson Airport, the Gardiner, Union Station or the subway system.
As this protest is racial in nature, I understand that the police is really caught in a tough position. If they remove the protesters with force, they get blamed for being racists and our multicultural city gets a bad rap. If the police can't remove them, they get blamed for not doing their job. However I think the police should do better than to stand and hope to contain the protesters while they hijack major city infrastructure.
While the Tamils may have gotten their voice heard through this protest (as they already have through their earlier downtown protests, car flags and bumper stickers), it's really going to hurt their reputation in Toronto. The fact that most of them live in "crime-ridden" Scarborough has given them a not-so-positive stereotype. This has just raised racial tensions even further. I predict that any more escalation of this protest campaign would result in a race riot. I hope that I'm wrong.