EDIT: This poll is about making Windows Phone 8.1 (even partly) open source, and is not about Windows 10 Mobile because obviously that would be impossible due to so much shared code between Windows 10 and Windows 10 Mobile.
I have been around on Windows Central for a relatively long time, and I watched as the platform slowly went to its grave step by step, mostly because of Microsoft's own doing. But that's not what I'm spending any more time on to debate anymore. I just point out that I was very bitter about the whole thing on Windows(Phone)Central for a long time.
Since Microsoft has given up on mobile completely (Andromeda
aside as a mysterious project that may or may not be a phone or a tablet or a foldable new category) I got dreaming how nice it would have been if Microsoft, as embracing of Open Source initiative they've become recently, decided to open source Windows Phone 8.1. Maybe not 10 Mobile - because it has too much operational Windows 10 in it - but just 8.1 as an offshoot of Windows 8.1.
In other news, recently it was revealed that Microsoft is embracing PWAs
or Progressive Web Apps (in coordination with Google) which means there will be a host of new website/apps that all OS's will embrace (Apple will have to join in too eventually).
So my mind married these two ideas: what if we could make Microsoft open source a dead platform (WP8.1), and developers could introduce newer versions of IE there where PWAs are supported...we could have a great little ecosystem of WPs that are as modern as they come, and is maintained by a Linux-like community of developers coming up with awesome things.
Those who think an Android launcher can do the same thing need not comment honestly, you've missed the whole point of Windows Phone from the Start (pun intended).
What do you guys think? Do you think Microsoft would do that, or are patents a problem for them or what? Do you think we can get a big enough community together to petition for something like this?