I strongly disagree.. new gear is always inspiration...it also makes it possible to realize your sound visions...
Sure it comes to a point of course...when you have everything you need...however...personally I am far far away from it.
And the gear you use also mirrors the outcome and the sound itself... so to have the gear that realize your visions is essential I think...
Also gear that gives you inspiration to create.
I think there is truth on both sides. New gear is almost always inspiring, but its what happens when the honeymoon period is over that matters. Do you still feel inspired by that gear to make great music and sounds? Should gear really inspire us at all?
Just like you can put any guitar in the hands of a great guitarist and the end result will always sound like them, it is much the same with synths and effects, if you give any synth or any reverb unit to many of the top tier electronic music guys, they will still create something that has their signature sound.
Cool high end gear should make your creative process and work flow smoother and more rewarding beyond initial inspiration.
I have only 4 synths in my collection, and pretty much have only 2 soft synths that I actaully consider using and between those 6...I have probably only just scratched the surface of what they can do. So I would say dig in and really learn the gear you have before moving on to more.
I actually sell any piece of gear that sits unused in my studio for six months. I want gear that I use on every session within reason.
Paul