Most altcoins are garbage, but there are a few that did advance the blockchain technologies and made us better understanding the cybercurrency. Yet none will ever getting close to bitcoin.
That's maybe true in the present because to be highly developed and to rise sky high like bitcoin now, altcoins need to have enough amount of time and draw plenty of attention to grow. But as time passes by, this might no longer true. Nothing can last forever and so does bitcoin, it will surely be replaced by another crypto coins, what's left now is the matter of time.
altcoin is not dependent on Bitcoin and Bitcoin does not depend also to altcoins but creating an altcoin would be beneficial since you can converts those alts to btc..
so its mean alt coins are depending on bitcoin, to me i think both bitcoin and alt coin are important to each other, to me as i most invest my assets in bitcoin and from there i futher invest my bitcoin into alt coin and same is the reverse procedure when i want to cash out my some money.
Some users does this, but even without altcoin it is possible to convert bitcoin to fiat. When it comes to altcoin, very few can be directly converted to fiat. In my view, trading can be effective with the altcoins but both were not mutually depending. Mostly alts depends for growth.
Altcoin users are mainly the ones who had a bad luck trying to get bitcoin, and they do that because the bitcoin has become very expensive and hard to mine in recent times, so what they do is mine and invest some money into the altcoins and then exchange them into bitcoin as it seems an effective way of acquiring it.
I am also doing this. If altcoins are not existing, I would not have got chances to experience the industry of mining completely because I came to know about mining only in late 2013 at that time itself ASICs started to dominate bitcoin mining.
Altcoins has become a way to increase bitcoin ammount, without it i doubt we will see people complaining and loosing their coins to shitty coins as well, but how to get more bitcoins without altcoins?
The thing is that trading of crypto currencies is the main source of new bitcoins, as mining now is just for few people, even with cloud mining there is a risk at it.