Ok, I'm super late on this, but I just wanted to throw my experience out there. I thought I would be a "walk alone" bride because both my father & my grand father are no longer with us, and any of my male family members that I would have liked to walk with me didn't come to the wedding. So I was going to walk solo, and totally didn't think it would be a big deal.
Holy crap, a day or two before the wedding I realized that I was petrified of walking by myself! Which is totally not me - but the wedding me disagreed. Anyway, my youngest step son Jonathan offered to walk with me & I found it to be very comforting & special.
With all that said - meeting your FI at the altar is the way to go - definitely no arguement there. But maybe is there SOMEONE that can be on standby for you if you need them??