If you had most of your holdings on safe ground, you would not be panicking. You have to decide what is best for yourself, but if I were you I would start liquidating my altcoins as early as possible. Bitcoin not only is safer, but could even cover your losses, especially now that segwit is almost guaranteed.
I agree with you, more secure if temporarily stored in real money. Store it in BANK.
Before the 1st of August BTC will slide, it's time to buy Bitcoin.