Count me in for wanting as much available online as possible. HOWEVER, if they do this I would also like to see their site security redone. Having one universal userid and password is ludicrous is this day and age! I've been doing Web design for almost 10 years now and for a company as large and exposed as Disney, their online "security" is laughable.
If they're going to give me the ability to check my point balances and book online (which I hope they do - they're about five years behind the curve on this one), they better make sure that I'm the ONLY one who can get in and do it! I think it would be only logical. At some point you would have to provide your member number or some sort of information to identify your account and pull up the information. To do so at login makes the most sense.