What if there were no more new speaker models?

Maybe the better question is do we really need to see improvements in amplifiers?

Which area would you rather see more improvement, amplifiers or speakers?

Maybe that’s the better question. Maybe amplifiers because those are enormously more complicated than speakers.  Solid state improvements to make better quality amplifiers at a much lower cost since you gotta pay so much more to get something that’s more in line with what tube amplifiers are all about. I don’t want odd harmonics, I want even harmonics, which is why apparently tube amps are inherently better than solid state.

I have had my main speakers for over 30 years. I would be OK with no new models.

@emergingsoul Maybe the better question is do we really need to see improvements in amplifiers?

This is a hobby which is typically based on wants not need. So no, we don’t need anything. 

And like all hobbies one uses a portion of their disposable income which varies with each individual.

What purpose would it serve to stop innovation? I do not see any benefit.

Maybe what the OP is really asking, is what’s currently available enough to satisfy? Yes for some, but nobody can answer for everyone. 

Throughout my life I have assembled and optimized a system, and then stopped and enjoyed if for 5 to 10 years. Keeping up on the technology, but just enjoying my system. Also, recovering financially. 

Then the urge would come to me and I would upgrade my system... one piece at a time... choosing carefully and investing 2x or more, so at the end I had a much better system. 

I now own the best system I have ever heard and am happier than with any previous system. It is as close to perfect as I have heard. 

So, lets say in anther five years from now I decided to upgrade. I would start my research from the ground up. Each brand name would have to reprove itself that at that price level it would be the right choice and synergistic with my grand design. 

I noticed my answer about my upgrade cycles does not intersect with your question at any point. So, I guess my answer is no. 

On the other hand. There is a  constant influx of new materials and subcomponents and philosophies of what perfect sound is and how to achieve it, so continued progress is being made towards reproducing the real thing... or a more sonically spectacular version of the real thing if you are into that. But that doesn't seems to say that a company standing still will get left behind. 

They better invent new amplification device and return to analogue recording. The combination of that would be a real progress.

I would think that designing great speakers is more difficult than designing great amplifiers. It is a fine art, not unlike building an instrument.