<p>If you took this approach, the essay must still imo somehow also show how you are now. Since you are applying to colleges now/soon, colleges will be interested to know what you are like now. </p>
<p>Therefore, it would be a mistake imo to submit an essay that mainly says what you are going to be, what you are going to think, what you are going to do, but little about what you are, think and do now. Remember, in other words, that talk is cheap.</p>
<p>Here fyi is a useful link from UVa about writing college essays.</p>