Though I really am still not a Fan, I've actually been using 4e (not) DnD as a "tool" to get people to play Castles & Crusades.
I've been Running "Encounter" Level sessions here and there, and in the (innevitable) post game discussions bringing up Castles and Crusades.
Some (obviously) stuck with 4e (not) DnD, but more than a few have now taken to Castles & Crusades - either as well as their Fantasy RPG of Choice or as their New Main System.
Though I am not a HUGE supporter of 4e (not) DnD, it is a good entry level RPG - very shiney, light on the Roleplaying, and heavy on the Combat Action - but (as is the general concensus amongst D&D Die-Hards) its not long before a lot of Players & DM's (both old and new) want more; and either change their style of play completely (whilst keeping with the 4e (not) DnD ruleset - generally heavily house-ruled) or move to a more enjoyable System. Castles & Crusades & Pathfinder being the most popular "live" D&D-Like Rulesets out there at the moment.
In summing up, Treat 4e (not) DnD as what it is; a good tool to draw people into the hobby - and nothing more.