As you say, this is a view based on age. However, it is also heavily based on the current situation. Should gaming companies such as Microsoft opt to move their best material onto portable devices (which is more than likely once the technology becomes available to them) then we’ll be talking about an entirely different scenario.
Right now, your two sons may need to play on home consoles. But later in their lives, it is highly likely that consoles may even become obsolete.