yes there is no doubt about this that bitcoin is a safe investment and that is the reason that i have invested more than my 70% assets in bitcoin.
Though bitcoin is considered safe but it is not really 100% safe, because it is a digital currency at the end no matter how strong it is or how large its community is, but it still has some demerits and price drops is one of them, but i feel believing it wont disappoint you for long run.
No, bitcoin is 100% safe if you are very much sure about your encryption. Bitcoin ecosystem will be safe as cryptography itself safer at least until quantum computers to be invented.
The safety of our bitcoin is truly dependent on our encryption levels. If you have strong password, you can have peace of mind like not worrying about the safety of bitcoin ecosystem and your bitcoins.