So, a network divided by incompatible protocols will not reach its full potential.
For some people, that might still feel like success. A half dozen incompatible protocols, sometimes bridged and sometimes not, maybe with some dual-stack nodes to spice things up a bit. The medium makes do.
So, somewhat agree, for varying definitions of success.
I think if there's a chance to get the whole network connected, and you can get full flourishing value, you have to try.