I doubt it.
I'm fairly familiar with the Elac speakers from that era. The sandwich cone midwoofers and the JET ribbon tweeters perform pretty darn well, and the measurements I have taken show that these speakers are objectively pretty good.
The directivity control probably isn't up to Genelec / Revel standards - it's a 6" midwoofer crossed at 2000 - 3000 Hz (depends on the model) to a ribbon tweeter with a minimal waveguide. Most of what this means is that room reflections matter more. So, if your room is pretty good - you're all set! If it isn't, you can buy less room-dependant speakers ($$$), or fix the acoustic problems that you should be fixing anyway (less $).
And, as a final note, the build quality and fit and finish on the cabinets and drivers of those Elacs is second to none. You won't find much better in that regard. Any modern budget things will be a serious step backwards in this regard.
If you decide to upgrade these, wait until you're ready to spend $3,000. These were masterpieces in their day, and I wouldn't replace them until you're ready to buy a modern equivalent.