Sure, but automatic shufflers are getting more and more common. Not to mention, you have to have a fairly large starting pot to have a hope of making a decent profit. Then even if you do everything right, you still have a relatively high chance of going in the red.
Not necessarily true. People still succeed at card counting with 6 deck shoes. The main problem is that you need a lot of capital for the odds to eventually even out in your favor. Even in the bast case scenario, you still only have a 1% advantage. There are counting groups that will pool tons of money and then split the total winnings as to maintain a higher average winnings.