Are advances in technology making speakers better?

B&w every few years upgrades there speaker line and other manufacturers do this to.  But because I have the earlier version does this mean it's inferior? Cable manufactures do the same thing.

How much more effort is required too perfect a speaker? my speaker is several years old and all the gear and the speaker are all broken in. And now I'm being told to upgrade.
 

I am so confused what should I do?