Glad to see you back on the bikes, DG. The bike cave looks like a fine place to store and work on bikes. Need to fill some of that empty space with tools, work stand, computer desk (for checking Sheldon Brown, Park Tool, Bike Forums or other online resources before undertaking a new mechanical project), mini beer fridge, stereo...the list goes on.

I've been using a lean-to bike storage rack for 15 years without any stability issues or concerns. The wieght of the bikes pushes it firmly against the wall and makes it very solid and stable. I really like how easy it is to relocate the rack if you need to rearrange the room. Mine is made of wood with non-adjustable support arms. Not an issue with horizontal top tube bikes, but the newer models with adjustable arms like yours would be essential for sloping top tube bikes.