No. Just... no. I honestly hate these stereotypes of electronic music.
First of all, a lot of electronic music is not cheap to make. Depending on what you're shooting for, you need to buy certain software and equipment (not just a computer) which can really add up. There are still relatively cost-effective ways to make it, yes. But as with acoustic and amplified music as well, it varies based on what exactly you're trying to create.
Second, saying it requires no knowledge is completely incorrect. You still need to actually know how to use the software and equipment. And by the way, there are physical instruments that produce electronic music too: Keyboards, synthesizers, electronic drum kits... and you obviously need to learn how to play them too.
http://www.youtube.com/watch?v=c5Zp2vIdZJA
Third, you can't really say that one has more overall potential than the other. They both have their advantages and disadvantages. Electronics can manipulate sounds in ways that acoustic and amplified instruments can't. There's also sampling.
Making electronic music takes just as much knowledge, practice and creativity, if not more, than acoustic and amplified music.