I definitely agree that personalization is the key - but on an individual basis.
That is the focus of our company - and why we feel RSS won't die - but its role will evolve as more info is consumed via Twitter/ etc/ etc - ignoring the social signs(data) readers/ users provide doesn't make much sense.
But personalization should always be an option - because the firehose is still very useful
There are already a number of these: different planet* aggregators for technologies, longreads for "longer pieces", etc...
A single aggregator? The world does not need it, because it's absolutely worthless and makes little to no sense. I probably don't want to read what you want to, and neither does the next guy.
> If people are going to pay for a newspaper subscription
There's a reason why newspaper are dying: by and large, people are not going to pay for a newspaper subscription.