Wouldn't the conjugation of poder change to a future tense in that case? I don't know well enough but I felt the reason that I used 'can' was because I recognized the conjugation of poder - puede to be present tense. Wouldn't the correct use of future tense be more like 'Esto podrá ser revolucionario?' I agree that in English it would sound much more natural to use the word 'could' in that statement, but I don't know if that would be understood unless one used future tense rather than present tense.
Ser = Permanent state of being (Por ejemplo: Soy viejo)
Estar = Temporary state of being (Por ejemplo: Estoy enfermo) (If you were sick all the time with like a terminal illness it would be "Soy Enfermo")
Soy, eres, es, somos, son = Conjugations of "Ser" present indicative form
Estoy, Está, Estás, Estamos, Están = Conjugations of "Estar" in present indicative form
That doesn't seem like correct English. Wouldn't you say, "This could be revoulutionary"?