That's already well underway here in the states. Many of the major online news outlets now only let you see 10 articles a month, then you must subscribe if you wish to see more. Personally, I don't go to those sites anymore. There are print publications to which I still subscribe. But when it comes to online, I think the best model would be to follow the lead of network television in the US. Instead of paying a subscription, just use advertising that can't be "clicked out of". I wouldn't mind watching ads if it meant I could read the material without a subscription.
What bugs me is when I already have a paid subscription to a print publication and I can't access it online unless I also purchase a subscription to the online version. I think publications like ESPN who give you access to their online version included in the cost of your print version have the best model. I used to subscribe to the Packer Report and it frosted me that I couldn't access their online material even though I purchased the print version. I don't subscribe to them anymore.
In Germany as well, we just launched new paid content concepts for two of our newspapers and I support the effort to establish paid content.
Let me try to explain why:
Before the internet the turnovers for Print Media was based on two columns
a) sold copies
b) advertisements
Advertisement is something that still works, even on the internet. (btw, part of my job). The problem is to find a concepts for paid concept ("sold copies"), something that is similar to a print subscription of print media, like for a newspaper or magazine.
But thats difficiult, not only because of the "all for free" internet culture, also because we need as much traffic as we can get on the websites to sell advertisements.
Online advertisements prices depend on how much traffic you have on your website.
So if you establish a paid content concept and people have to pay before they can access y0ur website you must be aware of the fact that your website traffic will decline what influences the prices you can demand for online advertisements.
Thats a problem, but thats the reason why most of the online sites will always offer at least a limited access for free, they need the internet traffic on their site.
And please dont forget -if you are visiting online sites like NYTimes, The Guardian, London Times or whatever, there are still so many people who work there to offer you the latest news and content. How should they be paid if everything is for free ?
But I agree with Croak, I would expect having an online access inclusive when paying a print subscription.