It's not really new information, the default Magento frontend "Luma Theme" will be discontinued by Adobe
This was communicated some time ago, but now confirmed again in the January update of the Magento Open Source Community Alliance.
That it will happen sooner or later was also foreseeable. The Luma theme was, to put it mildly, not a success story from the beginning.

So there has been the Open Letter that probably everyone involved with Magento has read and many signed. There have been lots of discussions around this letter already and many have voiced their opinions in blog posts and on social media.
Maybe a bit late to the party, I still want to add my take on this matter and express my view on this letter and the current situation as well as hopes for the future of Magento.
Upfront: The day the letter was published, after reading both, I was at first wondering why each of the two letters:
- Open Letter by MOSCA (Magento Open Source Community Alliance)
- The Future of Magento Open Source by Hyvä
seemed to set a quite different tone. However, wordings aside, with the core message and intentions behind the letters,
I can fully agree and signed the very first day.