Has biwire speaker cabling become "old" ?

Audiophiles are a fickle bunch, things become popular, then lose popularity, then cycle back around again. I've biwried, and not biwired, they both work.

The biwire does sound good, but for me, at this point in time, I'm having more success running a higher quality (re: more expensive) single wire run with a quality jumper. I wish I could afford to biwire with the cables I have, but sadly, I can't.

03-20-15: Rja
Funny thing, my Dunlavy speakers have bi-wire terminals. If he didn't believe in them why did he put them on his speakers?

Speaker designers do this for many reasons. Bi-amping is a higher priority reason that speaker manufacturers use multiple binding posts than bi-wiring though. Another reason is marketing, and meeting consumer demand.
Believe it or not, some people won't buy speakers if they can't bi-amp/bi-wire.

03-22-15: Jl35
Does having the second set of terminals and then using a jumper, degrade the performance you would get from a single terminal/single cable?

That's hard to say, since I've never heard any speakers that offer both options, single pair of binding posts and double pair of posts.
It would make for an interesting experiment though.