There may be a point at which any cryptocurrency (whether Bitcoin or another) is held on exchanges/wallets run by small/new companies.
Why so? It has never been the objective from the bitcoin community to endorse such practices. You said it yourself in the previous line. If you have any reason to think otherwise, do let us know.
Why don't there be hacks every other day?
Hacking is not a get-rich-quick scheme. A skilled hacker spends a lot of time observing, collecting data and on reconnaissance.
You dont jump the bank on any day you feel like do you? unless you are an idiot. You would want to know what security measures are in there, how much the loot is worth and how to cover yourself.
Hence you dont see hacks happening everyday, but that does not mean that hackers have stopped working. You have to keep yourself secure to avoid getting hacked. Major big exchanges usually get hacked because these are targets that can yield maximum money.