Welcome to the forum Marc
Good speakers are timeless, meaning if they were very good to begin with its unlikely updating your speakers will have a big benefit, even many years later. What makes a very good speaker? Accuracy. A speaker should be a blank slate that faithfully reproduces the signal without adding or taking away. It should be devoid of character, detailed, dynamic and full range, just like real sound. In the case of home theater 'full range' would be considered down to 60Hz and without a loss (or gain) of more than 3dB anywhere along its performance range.
All that having been said, and without finding any info on how they measure or compare to other speakers in their class, I wouldnt be surprised if updating was a benefit. While taking the time to audition speakers is universally recommended, I personally find that advice overrated and near impossible to implement in any place other than your own home. If you find speakers, like the ones I describe above, then the only thing you will manage to "dislike" about their performance is the source itself. Every other difference, between two different speakers, is the amount that each speaker strays from accuracy. The exception, to Type A's general rule of thumb, is whether a speaker is forward or more laid back. While both styles of speakers can be of the same accuracy their way of going about that accuracy can vary based on the type of technology employed. For example, I hate horn loaded speakers. Despite being a highly-rated, accurate and very detailed speaker I can honestly say Klipsch speakers will never grace my home. I also hate cheap speakers. Not because theyre cheap but because often the tweeters are so harsh that eventually I get listener fatigue that I must seriously limit their use or turn them off to let my ears rest after a given period of time.
So, whats your budget and location? We'll see if you have the resources to make the upgrade worth the time and money. Also, whats your enviroment like, got pics of your listening room? Youd be surprised how often the acoustics of the room is ignored.