This is going to be a huge project, like Ethereum or even bigger. Unfortunately, if one is looking at it only as an investment, the times of ICO's bringing massive returns like Lisk, Stratis, or Ethereum itself within a couple of years are probably gone. I'd be happy to get 1000% in a year after Tezos hit the exchanges.
I doubt if it will be bigger than Ethereum, due to its huge supply
But yes, Hype will be there for first few days
Staking (baking) can swallow the big supply... Few days hype, price rise and fall is not enough reason to dictate the future of Tezos. It can get to Ethereum price level at the moment, yes...but it may take years
Bridge is not built in a day