Yes, this is an open and shut debate, one that has already been done before, for that matter.
What you suggested wouldn't even be considered a real argument.
The usefulness of a tool is not determined by whether there are other tools that can do better.
That's like saying that our legs aren't useful for traveling, because cars can get us their faster.
That's like saying karate isn't useful for defending yourself, because there are knives and guns that give you a greater chance of survival.
There could be a billion other tools as useful or more useful than one tool, but that doesn't make that tool less useful, if it can still be used to serve the purpose in place of the others.
Seriously, check the definition of "useful".http://dictionary.reference.com/browse/useful
Having a beneficial use; serviceable
profitable, efficacious, beneficial.
1. being of use or service; serving some purpose; advantageous, helpful, or of good effect: a useful member of society.
2. of practical use, as for doing work; producing material results; supplying common needs
Anyone who suggests that would fall under the previously mentioned stupid