Re: Or the fourth option...
The chances are that those replacements wouldn't get security patches pushed to them and the multitude of "stores" that supported them would be fragmented and not policed for security issues. It's not a good scenario.
Let's all play Fantasy FUD!
The chances are that those replacements would only run on the Commodore Plus/4 and you'd have to run Mastertronic games on them and they didn't even have security in the 80s so it's not a good scenario.