True most of the exchange platform will really have less profit. Bitcoin perhaps will also be affected once the altcoin will disappear. and as far as I know through altcoin Bitcoin became popular because of it.

ICO is a super unpredictable investment that you can make in your life. and usually you will come to regret it. I say it is unpredictable because you never know , a coin can become super successful if the dev is good and the hype is great and the price can keep on rising even after the release but also it can die so fast which is the common thing happening with most coins and you lose money even after the release.

If you are not investing in any ico because its risky for you. I think you earn Bitcoin through mining isn't? or You play in gambling site or investing in cloud mining. Or maybe your staking your bitcoin through ghs.

Well if there is no altcoin the range of traders will be  to small because the only choice that they will have at that time is to only trade bitcoin to fiat and vise versa. I can say that those altcoins gives opportunity to bitcoin traders.

So much better for now that not to hold for more longer days for those ICO coins since mostly of them will last only for few days and suddenly dump, but as lisk mentioned if you really follow the progress of that coin at the very first addition in yobit you can earn huge money for that time since the price of lisk was surging at upper thrend at that moment but sadly as other ICO's did it was been massively dump as it is.

thats ture in my opinion the more of the coins get mined the less worthy they are, just like fiat i think, they print a lot of money so the inflation is really huge

But still it is good because through altcoins bitcoin is getting promoted more and more.
And I think that bitcoin without altcoin could have a lower price because to buy altcoins we should have first bitcoin.

I actually think that all these alt coins help better the value of bitcoin.  The reason is that everyone is looking for the next best better thing and bitcoin is it, the issue is that no one wants to let this happen.  So whether you find bitcoin through a recommendation or such, you have a better chance of finding it if you actually are using other forms of altcoin.

if you invest into an ico you should always remember that the risks are huge, thats why i never do such investments because i would lose money

bitcoin will be alive even theres no altcoin because it can be use by investors bitcoin was the first internet currency than other alt coin for me bitcoin will be more famous if there a alt coin in it and bitcoin is the main father of all alt coin or crypto currencyz