I think Ether recent price jumpis affeting on bitcoin in terms that the investors are going to invest in Ether but i think they will come around and go back to bitcoin

I don't think any of the altcoins that were created so far had any kind of effect on bitcoin. there is one thing that that might have affected bitcoin indirectly and that is merge mining which miners can use to earn more money on the side so they don't experience loss with bitcoin mining when the price swings down.

but altcoins are not without benefits either. since bitcoin is an open source technology anybody can and did change the code to their opinions and released a new coin which some of them are actually with interesting features.
also altcoins are an excellent way of earning more money (or bitcoin) whichever you choose by trading them in different exchangers.

Do you think that price of random altcoin will be major factor influencing bitcoin price? I highly doubt that.
If bitcoin will become really expensive in the future then you won't be buying 1 BTC but instead 0.1 or less.

There are some potentially good coins in those altcoins and that may or may not influence the bitcoins price directly but might move thousands of btc into that coins.The recent ethereum pump is a good example for this.
If bitcoin become really inexpensive then you will be buying hundreds of btc's,it is no realistic speculation.

if there is no  alt coin I think bitcoin price will rise, but i prefer there are few alt coins that appear like doge or litecoin, its making bitcoin cannot monopolize the economic

so i think its better to have alt coin, its keeping the balance of crypto currency value

Crypto landscape with only one coin would be kind of boring. Furthermore alts are good for testing, research & development and innovation of new features which could be implemented in BTC if usefull.Therefore alts have a right to exist imo.

I like Bitcoin a lot, but altcoins serve a purpose too. Only for the sake of "cheap mining" POS coins are a good alternative IMO (buy some with BTC, and make them stake interest). But beyond that, there are other functions as well (faster transfer, more anonymous, possibility to send smaller ammounts.)

altoin is such a sugar in the coffee. it only adds sweet taste. or we can say like complement. if they don't exist, the price of bitcoin will increase, then people only collect bitcoin so it will be harder to get bitcoin

bitcoin was created before any of the altcoins that we know today. so any altcoin exists because of bitcoin and copying that idea. but also they are an alternative way of investment which only affect bitcoin amount that we all have.

Bitcoin might have not reached such a state if there is no altcoin to compete with it. Now altcoin is growing high which will soon make bitcoins grow.