Do we have a current count on how many people are actually invested in Bitcoin, or at the very least how many people are using it, is there a good way to get that data anyhow?
you can only add official wallet numbers from blockchain, coinbase etc. that would lead to 1-5 mios i would estimate.
Also take into consideration that most addresses that have been used once in a transaction have either been dumped or is not used again. And a single user holds more or less 5 addresses in his/her wallet. Wallets created in blockchain.info and Coinbase aren't that much accurate when you are trying to figure out how many people are using bitcoins. I for one created 8 wallets from blockchain.info and 3 in Coinbase, but those never had the chance to receive even a single satoshi.