Not much. People who don't use it will find significant entrenchment in what they already have. Its not easy to switch to. People who do use it may see a cost reduction with cheaper deployment platforms and cheaper tools.

There may be a few people who pull bits of it in but I suspect that bad memories and some of the real nasty portability problems (perf counters, COM, services, registry, config, iis tie in etc) will be a lot of friction and a barrier to entry.

(I say this as someone who writes c# for a living)