Hi,
I’m happy to see this subject, I’m in kinda the same situation… 8 dollars for “just” a sync while I already pay for my 1To OneDrive is a kind of “mental barrier” for me, while I would be happy to pay 2 or 4 dollars for this.
In fact, the problem is not really the price but the functionnalities. To compete with all the concurrent services we need a lot more of “just a sync”. The major cons of Obsidian when I’m advices friends of collegues is always the lack of web access to the notes (with a browser) and the lack of sharing capabilities. I found a plugin to share a link but I need to work with my collegues, on a shared note.
Considering the technologie behind obsidian I imagine it wouldnt be that hard to create a little internet app, even if the functionnalities are not the same, synced with an account. Not as hard as creating a canva functionnality 
One of the main argument for Obsidian is the controle over our knowledge base, but as the software become more and more complex, my notes are no longer is an “open source” mode with a standard markdown behind. So I just have a proprietary software, editing proprietery formated note… but without all the functionnalities notion of onenote propose for the team work.
Thank you for all the work done. Obsidian is an amazing software. I’m really happy to use it and I will wait for the future updates