One can only do research, buy and... hope. When it comes to these coins (Navcoin, Vertcoin, PIVX, Digibyte etc.), we can argue either way on how they will fare. These will be just guesses and speculations.
Bitcoin and the more well-known coins and tokens have done very well price-wise over the past 12 months especially. And cryptos are increasingly gaining the attention of the mainstream throughout the world. It is indeed tempting to conclude that "the sky is the limit" .
This may well be the case in the coming months ahead, especially for some of these coins (I'm hoping Navcoin will be among the favoured, of course). But I'm also the cautious kind who tries not to get caught up in the hype and exuberance too much. Have to also think about the various negative developments that could happen. Including the very unpleasant thought of these cryptos crashing down to earth for whatever reason.
I hope things will continue to be like this for a while yet. But if this were a rock concert in a stadium, I'm staying near to where there's an exit. Not at the front where the action is.