.NET IIS and Microsoft

My question is
"will .NET survive ?"
Basically, there is a prediction of Windows loosing its market
completely and the whole world go for the open source GNU/GPL
OS Linux and other softwares.
And according to a survery the number of companies deploying
microsoft IIS servers are decreasing every year. If IIS isnt used
then learning .NET is merely waste.
Well, I personally feel as microsoft is introducing the next
generation .NET based OS code named 'LongHorn' I am pretty sure there
will be an increase in demand for .NET programmers but this may not
b the same for longtime though.