obsolesce
superannuate
obsolescent
obsolescence
go out with the ark
go by the wayside
obsolete
Betamax
outdate
antiquate
go the way of the dodo
go the way of the dinosaurs
on its way out
rust
life-expired
outdatedness
outmode
crumble
decay
dilapidate
rustiness
down the toilet
primitive
unravel
scuzz up
disutilize
die off
out of the ark
moribund
obsoleteness
stagnate
dilapidation
exploded
run into the ground
ruin
derelictness
go to pot
puppyism
melon-headed
flea-bitten
go to the dogs
ruinate
wreck
toshy
go to hell
outmoded
superannuated
behind the times
neolithic
erasability