In theory it'll work since the hops will get waterlogged and sink to the bottom. I think jmulligan is right though, you'll most likely end up getting the leaf hops into your glass when you pour. Sometimes after dryhopping too long (say, for a month or more) a grassy flavor can develop. Something else to consider is inconsistant dryhopping. One bottle may taste wonderful while another won't have enough aroma.