It depends on the perforamce of the bitcoin development. If it is done properly, I will trust and invest more into bitcoin.
Don't you think the current performance of bitcoin is good enough to make anyone trust it? It is growing, being adopted and its users database is also increasing day by day, what else you need for trusting it?
He says it depends on the performance of the bitcoin development. His meaning is unclear.
But I guess for most people, the higher the BTC price, the more people will trust.

Not only the price we can relay you can try with your self to use bitcoin in some stores that accept bitcoin as payment and if you can buy some stuffs there you will know that bitcoin is legit and should believe about it.. and bitcoin have a good potencial price in the future... so should believe in bitcoin before it lates.