You can hold, but I suggest that you don't hold the full amount in BTC.
You can consider to use part of the fund to buy some very popular alt coins, such as LTC or DOGE, when their prices are low.
So you will be able to migrate some risks, and not solely be affected by BTC price fluctuations.
I think it's not good to hold altcoins. Bitcoin is more trusted and it's better to make profit, altcoins are dying all the time and these popular altcoins you said doesn't change the price very much. Bitcoin changes price everytime, opportunity to make profit.
I would hold my bitcoins if I had that amount and convert the profits to fiat to invest the money in real world, but I don't have this money, so I can't do it unfortunatelly.