In a reported interview, NetApp's Jay Kidd, SVP and GM of its Emerging Products Group, said VMware's growth represents the death of DAS. You can't have directly-attached storage to a server, owned by that server, when it's running multiple virtual server environments.
You have to have storage resources available to those virtual servers when they are initiated and decide what to do with files and data when those services are destroyed. That means having the ability to have pools of storage waiting to be allocated when needed or storage that can have its I/O virtualised. It does mean that virtualised servers demand networked storage, be that at file or block level.
Blade servers can use DAS still. Indeed there are storage blades built for that purpose. Equally server blades can be booted off a SAN and fit neatly into networked storage too. So the direct-attach versus network-attach storage models will co-exist for a long time yet. VMware's rise doesn't signify the death of DAS overall; it just renders it inappropriate in the VMware world - a virtual death if you will.