I definitely will and that's what I'm currently doing. I hold more altcoins rather than Bitcoin. The price of BTC now is still the highest in the market and I believe that I will have more profit in the future if I'll invest my money in quality altcoins so whenever I have BTC, I use it to buy more altcoins.
I think there's nothing wrong with it, especially if the prevailing trend is more favorable for altcoins rather than going for Bitcoins. However, you should still do it with caution because you might not know when Bitcoin will once again surge in value, which would really make you regret losing it after it has gained significant value as compared to the amount when you sold it. Also, you have to take in mind that Bitcoin is still better than any other altcoin in the market, so it would still be a better move to hold Bitcoin.