Of course, anything is possible with the help of CGI, but is it physically possible to land a legitimate clean quadruple axel in competition? Or have we almost reached the limit of what is humanly possible in jump terms?
In terms of the 6 types of jump, quad jumps have been accomplished in 3 of them in competition - the 4T (first - Kurt Browning: 1988 World Championships), the 4S (first - Timothy Goebel: 1998 JGPF), and the 4Z (first - Brandon Mroz: Colorado Springs Invitational 2011). Nobody, however, has yet landed a 4R, a 4F, or a 4A in competition. Daisuke Takahashi has attempted the 4F (e.g. 2010 Worlds FS, 2010/11 GPF LP), but they have either been deemed underrotated or downgraded. Konstantin Menshov has attempted a 4R in practice, whilst Kevin Reynolds recently attempted one in his SP at the 2012 BC Summerskate. Hence, its likely that the 4F and 4R will be successfully landed in competition at some point in the next 10 years. But what about a 4A? Is that a step too far, and does it take us beyond what is humanly possible?