ZoomT, I would assert that your definition of a generalized softfork is incomplete.
I think your proposal sounds similar to "aux" blocks from above.
There is nothing wrong with these kinds of proposals except that they are arguably more complex for users.
My proposal is more like a simple blocksize hardfork, except can be deployed like a softfork.
In fact all softforks are basically 51% attacks on non-upgraded miners
Quoted.