The suggestion I've heard is that acoustic will make you better faster. In a way that's true, in that you have to gain greater strength to play acoustically. However, acoustic is itself a discipline and teaches you to play acoustically by virtue of how it sounds. That's ok and nothing to run away from and as a matter of fact, is worth embracing and to contine playing acoustically too.
That said, getting an electric and an amp will introduce new challenges and reveal weaknesses you may have known you had from playing acoustically.
While I can yammer with this stuff all day, key is to play what you want. If you know you are sticking with it and spending the money will not be wasted money, get an electric.
It's not a matter of replacing one with the other but expanding yourself.
Good luck!