No, I think that leaving a seat that you've paid for in protest of the ownership is hollow, hypocritical and weak. if you want the Glazers out you have to hit them where it hurts and these protests do not have any noticeable impact on revenue.
By all means protest outside of the ground before and after the match but don't buy tickets, concessions, megastore items or MUTV subscriptions if you're serious about getting them out.
The Glazers don't care one bit about the potential reputational damage of empty seats. Headline news around the world means more potential exposure for their commercial sponsors. All press is good press.