Well altcoins made several people earn and keep making people earn insanes ammounts with it,soo thats why they keep and will always be.The main fact is all altcoins has the xxx/uᴉoɔʇᴉq .I believe if were only uᴉoɔʇᴉq we could see some manipulation at the uᴉoɔʇᴉq value ,and well less people thinking its a scam project,but well altcoins are supporting the uᴉoɔʇᴉq earnings.
I think altcoins just preventing bitcoin to evolve and grow maybe i am not right but that's what i am thinking.
With the help of alt coin bitcoin can integrate some part of other alt coins so that bitcoin can evolve in to a better coin.
the question is HOW
i don't think altcoins have any benefit for bitcoin, correct me if i am wrong but there has been no change in bitcoin that was caused by altcoins!
If there hasn't been any change or improvement in Bitcoin, dont blame altcoins. Alts have lead the way in more secure algos, faster and larger blocks. There has been the learning that comes from 3000 independent experiments that Bitcoin could been cherrypicking. Instead, Bitcoin is bogged down by stubborn in-fighting, those freakin' tiny & slow 10 minute blocks. There's a lot that Bitcoin could adapt and use from the altcoin world to improve itself, if it wasn't so institutionalized, paralyzed, and dominated by a few vested interests. Bitcoin will never last with its impractically slow confirmations. The world will simply move on one day without Bitcoin if it doesn't get its shit together and absorb the best of the altcoin experiments.