If you're talking about global 'fan bases' I don't see why the UK government should see it as its mandate to interfere in the international dimensions of the sport/industry. Indeed, if the British-based clubs involved think they can boost their 'export' earnings through the new league, that's a good thing surely? Why is this suddenly a matter of urgent UK government policy?
As for UK football audiences, there have been some ridiculously overstated figures quoted in news media reports over the years, based on absurd numbers put out by the TV channels to blow smoke up potential advertisers' rear ends. I'm going to have to rebut your contention that combined viewing figures for the 'big six' are anything like the total who reportedly watched the funeral on Saturday - that would mean that one in five Britons would watch one or more of those matches. I just don't believe that. (Not that I much care either how many watched the funeral, but that's another matter!).
From what I can see, maybe 2 million people or so typically watch Premier League football on TV in the UK, sometimes as high as 3 million or even higher on a really big Saturday. Those are pretty big number but still a small minority of the population. And they will all still be able to watch Premier League football in the future with or without a new Euro league. Hey, they could watch European football as well if they wanted... as far as I know the shape of the ball and the rules are basically the same.
Yes the Euro league announcement all a hugely big and interesting development to people who are really into football, I'm sure. And bound to be the predominant sports story this week by the BBC et al, and with business section interest also. But given that fewer than half of Britons say they are actually interested in football at all (MORI surveys etc) it's going to be a minority who are really that bothered by the emergence of a new league, or its implications for other football leagues.
But presumably perceived to be very important to voters in Red Wall constituencies. Which is I suppose why the Prime Minister sees it as essential to drop everything to personally chair a round table meeting today to 'address the issue'. (More important apparently than needing to chair or even to attend COBRA meetings last year when the country was about to be hit by a pandemic that would go on to kill more than 125,000 people.)
Some sense of proportion and balance is all I was hoping for but I see it's still number one news story on the Beeb this morning and doubtless still will be this evening.