Is is really worthwhile to hold 3400 xrb till the future?
Were they rlly sure xrb will rise or not get rejected?

Yes. Someone like you was confused a few years back. He thought it might not be worth holding bitcoins which were worth a few cents as XRB today. Then he bought pizza with those thousands of bitcoins. Pizza was delicious. But he couldn't digest the pizza for his entire life. So moral of the story is don't be bitcoin pizza guy.
