More's Law:
If a little is good
more should be better,
so too much
should be just right!
That said, and fully understanding that it is of limited everyday usefullness, I have to say that they should have every right to produce and market it.
They are in business to make money. If they think they have found a market then they should try to sell a product that will fit that market.
I surely don't want anybody trying to tell me what is more than I need.
I don't care if they follow up with a .60 cal magnum.
Someone, somewhere might just find that they want one for walking around in bear country or as a backup for some nirto express double rifle in Africa.
It might be fun, if they add a good muzzle brake.