Not 100% sure that W10M can save Windows phone. The Problem is the Apps (like it or not), we cant get the apps because we don't have the marketshare but, we cant get the marketshare because we DONT have the apps. Microsoft's big push is what will possibly SAVE Windows Phone, this is Uninversal Apps and Android apps to WP. They are hoping these almost desperate pushes will get devs to make WP apps but, as I said above about marketshare, not sure on how well that will work.
The ONLY saving grace here is that Windows 10 (desktop) is a free update and if it's very minor code changes that can turn it into a universal app, it's possible it could work... It has positive aspects but, it has major flaws, that is for a different discussion.
As for W10m being a buggy mess, I think once the next build hits, you will be impressed. Now that features are locked, it's going to be for them to fix the bugs...With the wait in-between builds, I think the next build will be a major step.
So, in a nutshell, Do I think Windows 10 Mobile is going to fix Windows Phone, sad to say my answer is no.
We need to stop expecting miracles and just see where things go.
Miracles ? Man I am just waiting for apps that other phones have had for years. Or how about solid Smartwatch options ? Oh, the
FITNESS band that Microsoft made, that is not what I mean. It's fine to complain if your new but, for someone who started on WP the first day I could get one, It's beyond old now.
Most of us are not looking for "miracles" we are just looking for standards that have been available for EVERY OTHER PHONE. If they want to be Number 2 or 3 in the smart phone world, they NEED to have the options like every other phones have.
And a smartphone is NOT a toy (maybe to some) but, It's a TOOL.