There's no way they're going out of business. The move to the internet and web subscriptions has turned them from a niche English paper to one of the biggest in the World.
20 free Guardian articles a month is also an interesting entry point too. It's the ones with 2 or 3 that are almost pointless. You can click on something and find out it's not particularly interesting, or even just a short non-article, and that's 2 weeks worth of that site gone. If you're reading 20+ then it's reasonable to argue that you enjoy that newspaper, and, if you can afford to, should be giving a few quid a month.
If you're only reading City match reports, then you won't get close to needing to pay.