I agree that many of the alt-coins do not and will not provide any lasting added value to digital currencies. So many of them just seem to be projects that have been made for fun. Since most of these currencies seem to derive their value from bitcoin they can provide a legitimate value in someway since you are trading them and their value against the as the standard. Regardless of what currency it is this inherently adds value to the standard coin. This can be viewed in a way that is similar to International currencies all being measured against US dollar. Bitcoin is the US dollar and the other currencies are like the UK pound this Spanish dollar, or the Papua New Guinea Kina. The more alt currencies there are, the more legitimate bit coin becomes. There is also value in a simple meme as has been proved with Dogecoin. the OP is in my opinion correct in saying that you should be cautious when dealing with some of these alternatives but that does not mean that they do not have inherent value.
You're wrong on this.
Right now the cryptos are like visa , mastercard, discovery etc etc.
And , do you use visa to pay for gas , mastercard for groceries and discovery for condoms? Count out the promo offers they might have at a few stores.
Also , take a look at what happened in Europe.
One single currency that simplified a lot when your travel and make purchases.
I had a bag of coins and small paper change from my visits prior to that which i could only spend if I went back to France of Spain. Now I don't have to think about this anymore.