You may be aware already, but if you replace Pokemon with Magic the Gathering cards this actually becomes almost unbelievably close to a true story (minus the SEC story arc). The first "huge" bitcoin exchange[0] was originally a Magic card exchange which got extended to support cryptocurrencies. "Mt. Gox" = "Magic the Gathering online exchange". If it hadn't been hacked it would likely be in Coinbase's shoes right now and then your hypothetical would truly be eerily accurate. But of course it was hacked, it was a trading card exchange dealing in cryptocurrencies -- a major hack was basically inevitable.
Mtgox was not run very professionally, so I doubt they would have lasted this long. I had to deal with them on IRC to get my money out. I was told that the person with the keys to get my withdrawal was “in the bathtub”. This was on the last day or so before everything was shut down and during the actual crisis, mind you.
As an old coworker of mine said when MtGox imploded due to fraud and/or just abysmal security, “What? Don’t you do all your banking at the comic book shop?”
It would never have ended up in Coinbase's shoes. The founder is a notoriously bad programmer and business leader.
Even if he wasn't hacked he would've gone bankrupt because of his failing market manipulation bot that was making loss despite having full info to an exchange in the most over heated market of the past 50 years.
I don't think even A16Z would burn their money on MtGox.
0: https://en.wikipedia.org/wiki/Mt._Gox