It becomes a problem when the materials cost more than the retail price of the product.
We don't know the retail price yet. Nokia might raise the retail price to allow for the included music, which means it wouldn't affect the profit margin.
$100 on a $500 phone is 20% extra, which people may accept as a good deal in exchange for a year's unlimited music downloads.
If Sony or Nintendo or Microsoft sell a games console which includes a bundle of five or six games, they sell it at a significantly higher price than a console on its own, and people accept that. It seems logical to assume that people would also accept paying extra for a console if they could download unlimited numbers of games.
This is such a new product that we just don't know what the consumer will accept as a fair price. You can't compare it to previous deals because there has never been a deal like this before.
In this case, the figures come from another source
The site publishing the figures calls them "unconfirmed rumors", and none of the sources are named, so it's still not what I'd call reliable. Interesting, but not reliable.
This makes it more likely that only the big buyers will take out a subscription, reducing the amount of money made
The figures for fees that you mentioned were $35 per year and $100 per year.
$35 per year on music is about the cost of one full-price CD in Europe. One CD per year is not a "big buyer".
$100 per year on music is about the cost of three or four full-price CDs, still not a "big buyer".
Even if it was $200 a year, that would still be less than one full-price CD a month, still not a "big buyer".
I don't see how these levels of fees could possibly shut anyone out of the scheme, unless they're people who don't buy music at all, in which case they're irrelevant anyway.
Why should I pay for a subscription if I can get the same stuff for free? Ok, but I don't see that happening. If you don't want to pay for a song, you don't want to pay for a subscription either.
I'm not saying this is a magic bullet that will eliminate all piracy. What I'm saying is that this is a much much better way to fight piracy than DRM or legal threats.
Here's the choice people face at the moment:
1) Pay about $20 to $30 per album, so most people can only afford to buy a very limited amount of music
2) Pay nothing for an unlimited amount of music through piracy
The difference is huge. In money terms, you'd have to spend millions of dollars a year on albums in order to match the choice offered by piracy. If you want unlimited music there is no choice, you HAVE to go by the illegal route.
Here's the choice people would face with subscription schemes (let's assume your $100 figure is correct):
1) Pay about $100 per year for an unlimited amount of legal music
2) Pay nothing for an unlimited amount of music through piracy
The difference is tiny. In money terms it's just $100 a year to legally match piracy, or $8 a month. That's much, much easier to sell to consumers than the current position, and if it can be sold then it makes piracy irrelevant.
At those kinds of prices practically anyone could afford to go the legal route if they wanted to.
There's also the convenience of doing things legally. The legal route would be easier to use as it would be operating completely in the open, probably with dedicated technical support. If the service was tightly integrated into various devices, even the most pirate-friendly people might be tempted into trying it out, simply because it would be so handy to use.
And if music subscription services became a standard feature offered by service providers, people may not even realise they're paying such a fee. All they'd see is a music button on their device which lets them access all the music they want, the cost of which would be included in their monthly service charge.