For now I'd rather hold my bitcoin than spend it. Right now bitcoin value is high, so it's better not spend it often. Maybe in future, bitcoin might grower and the price rise up. So, I would feel regretful if I spend bitcoin.
You should also spend sometimes to help the circulation of bitcoin in market, but to earn good profits from it we need to hold majority of coins for future.
Yes I agree with you, if you are just going to hold your bitcoins you are not going to help the adoption of bitcoin. Instead you are stopping the opportunity of with bitcoin. Because you are one of the reason why bitcoins price is being stable at today's price.
But if you are going to spend actively you can help the ecosystem.