Maybe

It does seem likely that free and open source software will continue to gain popularity over the next decade. I don't think that proprietary software will disappear entirely, but it will become a smaller slice of the pie, being increasingly confined to niche typically business-to-business applications. Although it may seem far fetched now I think that software on consumer devices will eventually be overwhelmingly dominated by FOSS.

I expect that some time in the next decade Microsoft will lose its dominant position in the software world, and take its place as a more equal competitor alongside companies like IBM and Apple. From a technical standpoint it looks as if FOSS is overtaking (or has overtaken) Microsoft's core products (Windows and Office), and it's really only a combination of inertia, FUD and anti-competitive deals with retailers which is sustaining them at present. Sooner or later computer retailers, and then the average computer user, will realise that they don't need Microsoft software, and also the "security" software which they have for many years considered to be vital.