I don't think most members know just how large MS is. From discussions with staff I know they typically run 60 - 80 people answering phones. And during busy periods they'll have over 100 people manning the phone lines.
Let's just say we want 80 MS personnel on a Saturday. Assume they make $10.00/hour (I have no idea), so a Saturday is time and a half, or $15/hour. On top of that there's additional matching social security funds of about $1.12/hour. Throw in extra utilities for electricity, water, etc and perhaps we're up to $17/hour per employee. If 80 people worked 8 hours on a Saturday, it would cost us as members approximately $10,880 for the day.
And even with that, we'd hear people complain they're only open 8 hours, and not open at 7:00 pm on a Saturday night.
Now over time they would figure out the total daily manning requirements, but when you take 5 days worth of calls and spread them out over 6 days, you more often than not would just get more idle non-productive time, basically less efficiency.
Five days a week is just fine.
As to the question of on-line reservations, as has been discussed on this board in the past, such a system for DVC is considerably more complex than any on line banking system. DVC did announce that by December this year they will have the on-line reservation checking system. You will be able to log on, check your point balances, check your reservations, etc. It will be static only, that is you can see what's there. It will not be dynamic meaning you cannot actually do anything such as make a reservation. But who know, at least it's a first step.