If I deploy Linux, who will support it when I leave?

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http://www.linuxquestions.org – I'm a sysadmin for a small nonprofit which currently runs a mostly-Windows environment on Server 2003 in dire need of a hardware refresh. I've addled my brain for the past several weeks, coming up with all kinds of amazing things I could offer them with a Linux/BSD-based setup, all for very little cost compared to their commercial counterparts. My ideas involve, among other things, deploying Xen or KVM to virtualize the new server; replacing Server 2003 with CentOS & LDAP or Samba4; and handling storage with FreeNAS/ZFS as either a single-node or as a 2-node HAST failover cluster, depend (HowTos)