Netscape used to cost the equivalent of $100 inflation-adjusted dollars and was only forced to go free to compete with Internet Explorer. Now the genie can't be put back in the bottle, and anyone trying to sell you a browser would become irrelevant the same way Delphi's paid compiler lost out to free C compilers.

Maybe you could carve out a niche that's willing to pay, the same way C# did before dotnet core. But for a mass product the best-case scenario would be something similar to today's Opera.

However what it would do is open up the market to competition. Right now Google is spending a lot on Chrome development and Chrome advertisement. Opera and Edge both have given up on their own engines because they couldn't keep pace with Chrome development, and Firefox kept its engine but can't compete with Chrome's ad spend. If Chrome had to compete on a more even playing field there would be more room for diversity and competition. That could be a net positive, even if it makes Chrome worse.