I think when he learns about bitcoins and learn the possibilities it has, I think he will see it as an opportunity to grow and extend his reach (economically). Well, if he's that kind of person anyway. But he really doesn't need that but
I know he can buy majority of bitcoins.

Haha, I can imagine that he did. However, I've been thinking a bit more about it and I believe that he will try to weaken the dollar as soon as he has control over the FED. There are already rumors that Janet Yellen will resign after Trump became assigned president. Then all monetary locks will be opened.
Why would she want to resign if her term officially ends only in 2018? Trump didn't select her (she was selected by Obama), so he has no right to remove her from office, if I'm not mistaken. Given that Trump will have strong opposition in Washington, it is unlikely to happen before her term comes to an end due to "natural" causes. And we may well expect many of his decisions being openly sabotaged by the officials that he can't substitute with his own candidates till their terms end...
On the other hand, he certainly has a few candidates to take her place

I guess he may choose to appoint even two Fed chairmen (or chairwomen, for that matter) at once