Altcoin is a big help to increase the price of bitcoin because some altcoin competing bitcoin to be the best coin. But more of the users threat the altcoin as an other investment by trading to increase their income

Mining bitcoin alone isn't just very profitable right now. Mining alt coin, however, not only is it easier in terms of difficulty but it is also easier since you don't really need as much miners as you need like in bitcoins. Mining ETH for example is very easy and profitable if you're going to do it alone.

Well IMO I think bitcoin would still be better even if there were no altcoins. It's just that there will be no altcoin trading and some sites won't exist without it, and the bitcoin community wouldn't be the same as it is now earning decently on altcoin trading and the likes will be affected without altcoin.

I don’t think it will effect much to bitcoin because it has its own advantages and features and it does not depend upon other crypto-currencies.As for me only bitcoins matter and not any other altcoins much.

Bitcoin without altcoin could have not reached such a high level as its now. When the competence increases the growth will be enormous.

Yes that would be true that other coins are just alternatives. They may come handy when bitcoin will no longer be in the cycle. So at the meantime we just let them roam around and give traders more options in their portfolio and make trading more fun.  But let us focus on bitcoin since it is really what most people today are using and it is the most useful cryptocurrency at the moment.

None of the currency is dependant on any other currency so we can say that without altcoin there will be no lose to bitcoin, but if any issue occurred to bitcoin then people will lose trust on altcoins also as bitcoin is considered as the master of all crypto currencies.

Saying the truth i think that altcoins has increased and decreased the value of bitcoin, sometimes bitcoin crashes because traders move their bitcoins to altcoins to trade and invest there.

Bitcoin is the origin and the core version of digital currencies so I think it will be very fine without altcoin since it is the main, Altcoins in the other way won't actually exist without bitcoin since it is the main and gets the media coverage.

Altcoins have a long tradition in the Bitcoin community, but they tend to cause a contentious divide among those who think they’re useful and those who think they’re all scams. One side of the argument, articulated by the Satoshi Nakamoto Institute’s Daniel Krawisz, is that altcoins have no chance of success and distract possible users from Bitcoin, while the other side, articulated by many Ethereum supporters, believe platforms such as Bitcoin and Ethereum can work together.

I don’t think the Bitcoin developers ‒ they’re not doing things from a perceived competitive perspective. Their perspective is: ‘I have this awesome piece of technology, and I want to be able to help develop it and bring it more into what I think is interesting to build on top of this.’ So no, I don’t think it’s from a perceived threat of any of the altcoins.