Depends on what is meant by "two weekends learning".
I can think of at least 2 individuals who claimed to have swatted up the JAA IR theory in 4 days
It can be done if you have extremely good memory.
So I suggest caution. The devil as always is in the details. Interesting though...
But, finally, remember all this hangs on the "FCL008 IR" making it through the various stages. Currently it is no more than an unpublished committee proposal, seen by very few people outside that committee.
And there is no solution to the private+corporate jet pilots who, on one interpretation of the rules anyway, will need to get themselves the full 14-exam JAA CPL/IR.