I'm not fully sure what you imagine this alternative implementation of delivering updates would achieve.
You should be aware that the update repos are delivered via Akamai and have essentially unlimited resources in terms of Nokia's needs to push maemo updates, TMO however is hosted by a single server, entirely separate from Akamai. The reason TMO goes down is not because "zomg so many people are downloading teh updatez" as they come from a totally different source, it goes down simply because on update days there are THOUSANDS of concurrent visitors looking at the forum.
Changing the method of delivering updates doesnt in any way whatsoever affect the ability of the forum to cope with the number of people looking at the forum on the day a patch happens.