People have thought of them. Many have been proposed. Some have been tried.
Tried where? Worked where? In Mark Fisher's imagination? In yours? Do you really think "reimagining" is a thing?
There are always alternatives. The floating concrete life preserver is "an alternative." We just have to work out the kinks.
I don't say "STFU" to communists, although, if they got in power, they would surely say it to me. I do say, however, that they're fools. That's very different.