I'd argue you'd get more economic benefit abolishing patents entirely (not just the software ones, I mean the ones on reproducing someone elses car or gas furnace). You pay a cost in a loss of investment valuation towards invention because it is less economically beneficial if you can't have a monopoly on your patented good, but you benefit economically by letting new inventions reach natural price equilibrium immediately, and the spread of new inventions would propagate more inventions, even without a major profit motive - you still benefit being "first out the door" on a new idea. Which we see all the time in software, and then run into this problem where first out the door has already made a bunch but is now suing me for trying to do something even remotely in the same problem domain because I see demand there, but I won't be able to meet it because I'm artificially locked out of that market.
That applies to all economic domains. Patents worked back when it was extremely hard to sell your goods to its entire market, because you were either distance limited, communication limited, or production rate limited. In the first two situations someone could just take your idea, set up half way across the country, and made all the returns.
Today, I can invent anything I want and have it on ebay overnight and ship it anywhere in the world. I can advertise on most major ad services if I want, with an audience of the entire first world. The only limiting factor for me is demand, but that just means I have to be safe when bringing inventions to market, but it is good for the economy overall because it means if I can't meet demand, someone else will pick up the slack.
It is still, like I said, advantageous to the first to market with an idea, enough so that I wouldn't predict much of a drop in novel ideas. Like I said, I would expect more if technology and designs were more open and people could cheaply iterate and extend past concepts more readily.