The Bitcoin network is not having much difficulty with a couple of transactions per second. It is the community that struggles with adjusting to an appropriate throughput.
So you will be able to. He has done a lot of thinking around tree chains and scaling and optimiztion.
Btc is limited inamount of coins and came first, its value is as a currency.
Eth is the first popular blockchaindb. Coins are needed to pay miners and powet dapps.
If a currency cant be traded it idnt worth anything, however sidechains seem to provide a way to convert from one to another