The problem in the case of Microsoft isn't the repository of software, but the fact that they announced that it won't run native applications.
I am the maintainer of Lazarus-Wince and I have no plans to stop working on it, WinCE is more then only Windows Phone. People also use Lazarus to write apps for barcode scanners, for tablets and so on.
Of course if Microsoft really pulls this off, then it will be a hit for us.
In any case I am planning on starting an Android widgetset for Lazarus, so that should more then make up for our loss of Windows Phone platform, as Android is growing very strong now.
Financial contributions for this project are of course welcome. (just contact me via PM/e-mail)