If you have enough buying power, then you can make what you made before. If you use enough brain power, you can as well. I guess we can abbreviate both BP, huh?
To me, arb is an evolving process like stock trading is. If you are doing anything that is "classically defined", like "classic merger arb" of course you are toast. Do you think that its just going to be that easy as put on a spread and hope the deal closes? Come on, obviously its not like that.
Use your brain to think. I don't buy the, well what I will call an excuse, that you can't make the same money, blah blah blah. The only way to do that is to use your brain and devise relationships that the world is not trading en masse. You can sit on your butt and crank out trades when its really good, but part of that time should be spent thinking forward and creating some type of new workable tradable stuff. We did this all the time when I was taught Merger Arb, and even though a lot of the new stuff didn't work, that attitude of feeling confident enough to devise, test, and trade new relationships is a key part of my current trading. It felt good also to see my ideas, as a new trader, being developed by others in a group.
One of my former bosses said to me," You know when stuff isn't working and we aren't making money, if conditions have changed, I don't go home and cry to my wife that its not working. I sit here and work like a horse until I come up with something that works." Don't sit here and cry on ET that stuff doesn't work, go out and find things that do. If you like spreading stuff, there are many combinations you can trade.