I also have this same question. For 19.95 per year can you keep your Verizon Email address even though you may not be able to use Verizon High Seed FIOS or their DSL service to carry your internet account ?
you can technically order any product from verizon internet for example their back up and sharing for 2-4 bux a month, their internet security for 5.99 and as long as you keep that it keeps your username.
those are standalone products, and anyone can order them, you don't have to be a verizon customer to get them, or have verizon service. so keeping one of those active or the domain like you guys said would keep your username until you cancelled the services with verizon