I couldn't care less if anyone else bows...though I stand by my statement that we must be respectful in the presence of our shihan if we wish to make Aikido more than a weekend hobby.
I like the bow myself, but a slavish keeping of form is not real respect. I've seen plenty of bows that were empty or even insulting.
Respect has everything to do with intent, not the outward form of it.
My own personal experiences with shihan is that they are MUCH more flexible than a lot of people posting here are about requiring a bow to show respect. That is, a part of who they are includes a great deal of respect for other peoples limitations.
As an aside, I believe most people's experience of or with their shihan is primarily on weekends, so I fail to see how that helps them become something more than "weekend hobbyists".