What is the importance of WAP version of web systems? to cater those mobile phones that does not support standard HTML pages?
as wikipedia says, wap was mainly designed for internet-access with mobile-phones. this doesn't apply to modern smartphones as all of them are using browsers that fully support http, so theres no need for wap anymore.
that said and reading the section about the "commercial status" of wap, it's (nearly) dead - either people have a smartphone for mobile browsing or they don't event want mobile internet access.