Most existing coins will disappear in the future, so yeah, there is always a room for something new and good. There are 1,610 different altcoins listed on Coinmarketcap with total value $389,450,312,883 as of right now. Of course one may argue that that's not a real value, but no one can deny that the coins worth something, and that "something" means dozens of billions USD. Even if the demand will remain on today's level (which will hardly be the case, it will surely rise) there always will be billions of USD "waiting" for a new promising coin to be invested in.