I'm not exactly sure what you mean by that but forcing me to use IE will not force me to view ads. I'll simply change from using Adblock to something like Privoxy and the devs of Privoxy and things like it will make it transparent to the web servers as possible.
Ad blocking isn't the exclusive domain of Open Source. Heavy handed action against open source network products won't force people to view ads. Or you may have meant ads support some subset of FOSS development. Possibly true but not enough to put any sort of end to FOSS.