There's a little revolution at work. My colleagues are taking their laptops or monitors and keyboards, and are propping them on boxes and low tables to making standing desks of their ordinary chair-based models. And I might be next. It seems that sitting may be bad for your health. (Perhaps you've been sent this article, or one like it.)
Now, the church. If you're Orthodox Christian, standing may not be so strange an idea. Seats (or leaning!) for those unable to stand, but most people stand. I've only ever been to one standing Orthodox service (a memorial) but even there I could see how a standing posture leads to more natural movement in worship -- and nobody dozed off. Of course, the church itself is a distraction from the world, towards heavenly realities. So if my 41-year old self (or my remembered 5-year-old self) would get lost looking at an icon, or step over to light a candle and pray -- well, what's the harm. It makes a stiff, straight pew pointed to one speaker seem downright autocratic. So long as I wasn't actually at attention I think most people could stand for a church service.
The proof of concept: Think about how long people stand for coffee hour and how active they are then.
Oh, and this is my 3,000th blog post.