Users can easily wait couple of weeks or even months for those exchanges to open but where will miners sell bitcoins to pay their electricity bills?
99% of users use bitcoin only to diversify their assets. They can wait. Miners can't!
If Bitcoin goes down all the crypto economy goes down with it irrespective of the coin used.
Definitely miners depend on users and not vice versa. UASF is a very good idea and should be respected by honest miners.
Who can wait? Who is only diversifying? I am, many people are, but if it really were 99% we wouldn't have had this dump. So it is obvious it is more than 1% of users that can't wait. They couldn't in late 2013 and 2014 and they can't now (the new weak hands... earlier ones are long gone now).
Also, if someone is SURE the price will keep going lower it is better to sell now and rebuy lower (except in case of tax issues).