1 - Theorically any wallet can be found with brute force.
Theoretically, it is entirely possible to earn billions of dollars from continuous winnings in the lottery. Practically, if you ever try that, besides loss of lots of money, you'll realized that you're losing your time.
2- With todays hardware technology is imposible to find a private key.
You can find a private key by generating a random number. To find a private key for a
specific address is what is currently considered infeasible.
Thats the reason i sold all my bitcoins. I beleive in cypto tecnology, but sooner or later a Bitcoin Private Key will be stolen by bruteforce and the market will lost its value.
Despite the forces of the universe, we, humans, use consensus to solve this kind of problems.