Selling = using = adoptation = greatest year ever.
Hodling = not using = modest adoptation = same or little better than last year (at best), but with even more volatility (and that's bad longterm)
Holding = less bitcoin available = use of smaller BTC denomination (like m
BTC) = purchase power of bitcoin going up
When there are enough merchants who adopt bitcoin and give discounts people will use it because it's simple and much easier. It has value as a payment system, that's one of the reasons people are adopting. Holding will not negate the value.