Well, I'm an usual Internet user.
I am already bored with welcome pages displaying flash animations and quickly click on "pass the intro", as soon as I can.
What is the real use of this modification? I believe that if I go to your website and submit, and then see that nothing happens, I close my browser's page and go to another website. It is just a "typical Internet user" behaviour, I think. Maybe I am wrong. Howether, I let you explain where you are wright and where I am wrong, as webmasters' job is to attract visitors in the five first seconds they once visit the site.
Sorry for the post, but don't think your visitors are only
donkeys.
There already exists people having lowband connexion and screens displaying images 800X600 pixels, even if we are in the 21th century world ( I see it every day), who may not bear your conditions.