It was known that the lobby would be open to the public, so to some extend everbody knew that people (and kids among them) would show up there to get a look at us. While I noticed some children around, to me their number never seemed to grow to over one digit at any given time, though I am sure being in the suit makes you more aware of them.
I guess it all comes down to common sense: If they bother you as much as you state here, you should only suit in the public parts of the hotel (löbby, front & back of the building) during evening/night hours where you are unlikely to meet kids. If you desire to suit during the day, stick to private areas (SIG-rooms, C-Deck, Pianobar, private rooms etc.) and maybe have someone around to shield you a bit on your way from the fursuit lounge to those areas.
I agree that it would be nice to have the "Furbidden City" connect directly to the private areas of the hotel, but unless staff wants to swap Dealer's Den rooms with the current Fursuit Lounge, I don't see that being a viable option. Also the current position works much better for all other events on the main stage, especially the dances.
Keeping children out of the lobby seems both not possible (it is public area) and not desirable. After all, kids help much in getting their parents and grandparents to interact with us furs and form an opinion about us.