- smaller blockchain size then BTC atm (I assume size is growing faster then BTC's, any estimations when this could happen?)
I assume you are talking about the total of BTC and XMR in circulation? They should be equal in 2040:
Also, note the supply rate will be similar from 2019 to 2027. You can read this very interesting reddit post to get more info: https://www.reddit.com/r/Monero/comments/512kwh/useful_for_learning_about_monero_coin_emission/