You lack imagination. If Facebook offers Coinbase tomorrow 100 billion dollars, they won't sell?
This brings us to an interesting thought. Cryptocurrency transaction values have been steady growing, starting from pizzas to alpaca socks and now it's even possible to settle multi million dollar transactions. In the the future we'll probably see larger, billion dollar plus aquisitions settled in cryptocurrency, why not? For that to happen though, their marketcaps will need to rise significantly from what they are now, at least to multi trillion dollar levels.