Implementing it in every descendant really isnt all that much of a hastle.  Remember that this code is getting generated (mostly) by a templating system anyway.  The bigger issue is that im not really sure I want to be going with generics.  Currently the system runs on Mono 1.9.2.  All the CLR & C# 2.0 features are there, but the ASP.Net 2.0 and 2.0 Framework libraries are far from complete.  Since the templates are based on CodeDOM, I'd have to switch to a 2.0 backend to get 2.0 support.