They will simply not package the closed source version, ship the last open source one and deprecate the use of Mono for the future. Remember: there is no lock-in with Free Software. It cannot happen, period.
You'd be surprised at how many corporations are going with Sharepoint, it's the silent Apache HTTPD killer...
I hate to break it to you, but Sharepoint isn't an HTTP server.
It appearsAlexBirch's point missed you: SharePoint Server replaces several uses of HTTP servers such as IIS, Lighttpd, and Apache. The idea is to switch the intranet from web apps to SharePoint and reserve the web servers for customer-facing sites.
People who want to work for/shill for/suck up to Microsoft directly or indirectly should do that.
Those who don't support that sort of thing should work to cut them off at the knees by not using their software and discouraging others from doing so.
It has just been discovered that research causes cancer in rats.