Plenty other projects have adapted the concept or even forked the code. The core team behind this back when it was named opencoin are without a doubt millionaires now and some even billionaires. So you are right but it way way to late now. Not to says that there could not be a even better solutions. But its already several thousand times better if you compare raw metrics like speed/TPS/energy usage etc. an even better solution would likely not make that much of a difference again.