Yes, some people will get screwed. Hopefully this will result in less locals being screwed than if nothing was done.
What the tax can achieve though, is build up a stockpile of money for the government to address the affordability problems by improving mass transit, building affordable housing, etc. This is the realistic best-case outcome. Prices are not going down.
of course not. How would adding new tax may result in lower prices in under-supplied market? If a person buys something for 2.3M instead of 2M it is higher price for that person (it doesn't matter who those money were consumed by). That person to make profit will be using the 2.3M as base to make selling decision, calculate profit, etc. Thus it will drive prices up.
Only in oversupplied(buyer's) market such tax may have resulted in lower prices by deterring buyers and thus decreasing liquidity.
http://business.financialpost.com/news/economy/is-canadas-ho... Is Canada’s housing bubble about to burst? May 20, 2010 2:46 PM ET
And let's not forget this blog post gloating in 2008 October the Vancouver housing bubble finally has burst... http://www.investingintelligently.com/2008/10/24/global-tv-s... In 2004 (!) http://www2.jurock.com/articles/columnist.asp?id=3723 is it a bubble?