I don't understand why people are surprised by this news.... lightning network was never meant to be bitcoin-only.
Tether is maybe playing 3d chess here and they are probably trying to mitigate risks with new mica regulations and USDT ban in EU.
For me LN is a failed project and I don't expect anything special out of this, but let's see what happens.
People are surprised by this news because the information and expectations of Bitcoin Lighting is messed up. They made people believe that Bitcoin lighting is easy to use, it's simple and fast while in reality it's very complicated for an average user to use. It's also very impractical to use too. You are right, LN has failed!
Because if bigger blocks actually was the answer to user adoption, then explain your Lord Roger Ver's BCash.
Bitcoin is successful, right? Do we need to use it as a payment method or do we need to use it as wealth storage? I think that we need most but most importantly, we should value Bitcoin because it's a good P2P payment method, one of the most decentralized coin, compared to other coins. Bitcoin's popularity and increased adoption mean that many people want to use Bitcoin as a payment method. If we don't increase the block size, it will become impossible for people to use Bitcoin and then they'll move on altcoins that offer fast and cheap transactions. 1 MB block size was normal during satoshi's era but after that, everything has advanced and some old things have to change for a better future.
As I said above, bigger blocks are necessary but it's not the reason why Bitcoin Cash is not successful, this coin has many other problems and one of the most important problem is that they don't listen to others and promote a false propaganda.