It may never happen...
Even if he starts losing, his chin is good and he's probably humble enough to have a more defensive style( i.e. not doing the hands down/dodging as much)...plus his ground defense, in general, is really good.
As he gets older...I just see him being slower and getting taken down more...probably losing decisions where he can't stay upright enough to knock guys out...he won't be getting stopped/dominated and he'll still have his moments...his jiujitsu may even become more of a threat.
Those young wrestlers at WW like Rory and maybe even George(

) can't wait until Da Gawd becomes mortal.
And Silva usually centers around using his jab b/c he has a solid reach advantage against everyone he fights...but when he fights guys equal/longer reaches, it's either a clinch war( vs. Bonnar) or he boxes them up throwing a lot more hooks, uppercuts, etc.( vs. Griffin)....he's gonna try to Griffin Bones...

and it may work.