The existence of smart contracts will solidify Cardano's position in the crypto market, and will definitely make the competition for big coins hotter, considering that Cardano has now ranked 5th on coinmarketcap, let's see what Cardano smart contracts will show.
I think they will not satisfy the expectations of their investors. I doubt their ability to compete with smart contracts giants Ethereum and would end like others who tried to do the same. I expect that Cardano's price will lower down once its Smart contracts would be implemented. Better if you take profit now and try to minimize the risk of losing.