Holding your BTC stash for at least 5 years from now could make you some significant ROI!
Sure nothing is set in stone, but with SegWit getting activated soon, this will be a completely new protocol with so many great new technologies to get implemented. Lightning Network and similar interoperable implementations, MAST, Tumblebit, MimbleWimble, Confidential transaction, Schnoor Sigs. The next will be pretty interesting from that point of view.Furthermore in the middle of 2020 we are going to see the next halving.
So yes holding is definitely worth a try here! However only invest what you can afford to lose!!