It would be used less more and also be less more successful because the bitcoin is also became popular because of the altcoins
No, those alt coins doesn't even have something to do for bitcoins success. Bitcoin became successful all of the sudden when those early adopters found out that it can used as a medium of transactions. And those alt coins that came out just copy cat the idea of bitcoin because many developers saw the potential of crypto currency which bitcoin is the original source of it.
Wrong. Altcoin's company has introduced a lot of people to bitcoins. Without them, bitcoin wouldn't be as successful as it is right now. I know that altcoins are just a copy of bitcoins and people mainly just use altcoins to earn even more bitcoins, but that's okay. The gist is that every new member of the altcoin community is eventually a new member of the bitcoin community. The introduction of altcoins is one of the key to reach mass adoption. I've never seen someone promoting bitcoins but I've seen tons of people promoting a certain altcoin.
Bitcoin might already have become recognized even without altcoins but that recognition wouldn't push forward if it wasn't because of the help of altcoins. The bitcoin success would be much slower without altcoins.