The "only" things that could push owners like the Glazers out would be either:
a) Mass boycott of at least 5-10 home games in a row. And I do mean an almost empty Old Trafford. Sponsors and the Premier League as a commercial product would see this as very damaging. This will never happen. Our fanbase is simply way too divided to even organize the smallest of boycotts. Old Trafford has been packed to the brim every time these boycotts have been tried. The '58 protest group do what they can, but it's just a drop in the ocean.
b) Preventing several home games in a row being played by invading Old Trafford, much like the Liverpool protests a few years back. This would eventually force the FA to punish United economically or with points deductions. Sponsors would also hate this. It's not very likely this would happen, because the police will be much more forceful than last time. It would surely end in violence and severe punishments for protesters and the club. I see this as the most viable option, since it already happened once. But I have no faith it could be done again and again until it forces them out. If riots get way out of hand, the government would eventually be forced to dispatch the military.
c) If United gets relegated. It would likely result in a massive ramp-up in protests, or it would simply drastically lower the dividends the Glazers could extract from the club. Not to mention the massive drop-off from sponsors. But this is as likely to happen as Luton to qualify for the Champions League.
So short answer: No.
It's not very likely in the slightest that our deeply divided fanbase will be able to push the Glazers out. They don't give a toss about fans chanting anti-Glazer songs. And the media already seems bored talking about it. It gets a mention, and the fan channels do talk about it. But the Glazers aren't bothered, evidenced by their nerve to show up at recent finals willy-nilly.