Is it wise to not invest now and miss all future gains/dividends and face the risk with currency (inflation/deflation/other)? Remember, there is no such thing as "not invested".
The more important question to ask is: would you be finde when investing, than the day after the market tanks and stays low for 10 years. If you can answer "yes", than invest. If this is money needed in the next 10 years, then dont invest in the market, go for vehicles with lower volatility.