it is noted last eight to nine months that bitcoin is not stable.bitcoins movement is very uncertain due to this altcoin are very badly affected.So it is necessary to predict movement of bitcoin to avoid unnecessary loss in altcoins.
It is note able that almost all altcoins are now 80%to 90% negative from their all time high due to this happen only bitcoin uncertainty.
Now this is not clear what happen to next on bitcoin near future because bitcions dominance is increasing and altcoin crasing.So becareful if you holding any atcons for long term investment ...
For sure not all of the alt-coin is a bad investment for the long run.
There are still who could come up and follow the market surely most of the alt-coin drops down,
But we have seen them rise up just like Bitcoin and they are also surviving so we couldn't tell for sure that it would be bad for a long term hold.