You can participate in Maddof schemes for a number of times until you get burnt. This is the equivalent of "im buying the dip because altcoins are low, and altcoins always come back". Eventually, altcoins will not be comming back, and the tide will finally shift towards natural state of things (total BTC domination), then altcoin bagholders will have their last cry on reddit about how they became scammed by this and that token.
It depends very much on the alt doesn't it? At some point someone is going to make an alt that has features retail investors and users find attractive and useful. At which point that alt will do what Facebook did to MySpace.