So at some point we all have to pay ?
Not all of us. Only Americans and all those people in the countries that import US debt which is almost all the world at least until they finish dedollarizing.
And not at some point, they have been paying every second of every day for every cent that the US regime prints...
Or they can grow it bigger ?
It can and it will.
That's is the nature of Ponzi schemes. They keep on growing bigger until the "bubble" pops and it all comes down crumbling.
However If debt is taken too easy it will put the value of money in danger rich has a lot money so they most likely want protect value of money since they been working so hard to get money.
Actually the "rich" have a lot of assets not exactly fiat.
For example they have real estate, companies, factories, gold, bitcoin, collectibles like expensive paintings, etc. so they don't really care if the "fiat" tanks.
But Europe want to pay Because they are ally of USA
US regime has no allies. They only have enemies and idiots whom they milk. Europe is the later. Since they lack independence, they are forced to "pay" the US regime. We could see this clearly during their energy crisis, US basically forced them to deindustrialize and purchase their super expensive energy instead of buying the ultra cheap energy from sources nearby including Russia and West Asia...