I do not agree with OP. If the holders start selling their coins that will make a massive crash in the markets, we need buyers on the markets to make the price goes up, and that doesn't involve the holders, the prise is based on the bitcoin in the market.
Hold all the way! That's the way to go.
While spending the BTC definitely adds some selling pressure(assuming you don't immediately buy-back the bitcoin you spend), I don't think it's going to be significant. It's not like people are going to buy cars and houses with bitcoin, it's mostly just going to be game credits, VPN/hosting payments, and such. Using bitcoin to buy groceries and such simply mostly isn't here yet(unless you use those BTC debit cards).
Personally, I'm just going to hold as much as possible. If I were to spend, I immediately buy-back the spent BTC.