Bitcoin network has been under attack
Nah. Not attack, just normal usage.
and the results has been very high transaction fees
Satoshi said that eventually the miners would be paid with transaction ees instead of new bitcoins. Sounds like this fits into his plan.
which has made many people who use it for transactions to use alternatives.
That's the way the free market works. As less transactions happen, the fees will come back down. Eventually it will reach an equilibrium where the cost to use Bitcoin matches the price people are willing to pay for what it offers.
This is challenging to the vision of Satoshi
This IS the vision of Satoshi.
when he created Bitcoin for use also as currency
You can still use it as a currency if you are willing to pay the fees, or if you have a Lightning Channel already open. Eventually either the fees will come back down or enough people will be willing to pay the higher fees.
as many people will criticize the network as unfit for transactions if accepted for use and everyone starts to use it.
People have been criticizing the Bitcoin network since January of 2009. There's nothing new about that. Some people just like to complain, there isn't anything that will ever satisfy them. And yet, here's Bitcoin, 14 years later, still doing it's thing and working just fine.
There is no way that Satoshi is not aware of the current situation if still alive,
I've been pretty sure he's been dead for about a decade now. Doesn't really matter either way. Bitcoin has grown beyond his ability to have any real influence over it anyhow.
do you think what is happening right now is enough to draw Satoshi out
What do I think? I think he's dead and has been for a while now.
to still make some changes or improvemens annonymously?
If he's alive, he can certainly participate anonymously in the open source code submissions, but so can you , and so can I. Doesn't really matter. Code changes aren't going to be included into Bitcoin Core without the approval of the team that maintains it, and the world isn't going to accept any hard-fork changes without a very good reason.