This has been anticipated for a while now (http://tvnz.co.nz/health-news/fears-h1n1-resist-tamiflu-drug...). Also Tamiflu was only of limited use to begin with and then it was wildly overused, so it was inevitable that natural selection would favor resistant strains. Many countries now have huge stockpiles, so I suppose they'll keep on using it, whether or not it's actually effective.