I said this on HN yesterday, but I'll repeat again since it's VERY relevant.
I'd like the subscription, as you mention too!
What I'd like even more (for voluntary payment) is a subscription that divvies up my monthly 'budget' according to the % of the time I spent on different sites. Say I spend 50% of my browsing time on Nytimes, 30% on HN and 20% on New Yorker, and my monthly allocated budget is $20. Then NYT gets $10, HN gets $6, NYer $4, etc.
Or perhaps, a monthly budget where the money is deducted for subscription sites, per article/time whatever. Once my budget is finished, I see 'normal' web like everyone else does.
I don't really care about ads, but maybe people who don't want to see ads could pay like, 2x as much, etc.
There doesn't seem to be a lot of innovation in this field. Perhaps it's the difficulty of integrating everything in one place?
Edit after reading the comments: Google contributor just removes ads instead of getting you 'special pass' right? Do the site owners get paid for the 'eyeballs' from the subscribers?