Is it time to increase the blocksize cap?

No you haven’t. You showed a hypothetical, massively unrealistic, situation in which only 3 million edges are added to the Lightning network per day. We have 7 billion people on this planet. If you really want each and every one of them to be able to reap the benefits of ultra sound money, they all need to be able to open and close multiple channels. Assuming they all open just ONE channel (for argument’s sake, although one channel for a lifetime is unrealistic), it would take 7 years to onboard the planet.