I am not sure I agree with you -- from a marketing/business perspective. Or at least -- I see the other side of the coin.
Rohrbaugh has essentially made one gun to date -- the R9. (The R380 really doesn't count...it's just a detune of the R9
). To say they have established their niche as a pocket pistol maker seems a bit premature. I think Karl would say that his intent is to establish himself as a high-end, or even semi-custom, pistol maker.
From a business perspective, what happens if they develop a tiny pocket-sized R45? Doesn't it cannibalize their own market for the R9? How many people are going to carry an R9 in one pocket and an R45 in another? R9 sales may theoretically slow down (no end to demand in sight yet, but...) because people decide the R45 is better than the R9, right?
(Don't even get me started on whether .45 ACP is really the right choice for a pocket gun. I am not sure that it is...but that is a different topic).
On the other hand, what if Rohrbaugh sets out to make a high quality semi-custom compact (but not subcompact or pocket) pistol? Existing customers who love their pocket guns may branch out to an R45 as a better "primary" carry gun. Customers wind up with a Rohrbaugh in their pocket and a Rohrbaugh on their belt... Pretty cool. And, you attract a whole new line of customers who don't want a pocket gun at all, but like finely crafted pistols.
Since you mention Kel-Tec, let's use them as an example. They created the P-11 -- a subcompact 9mm. Then the P-32 and P-3AT. Where they a pocket gun company? Then they created a pistol caliber carbine, then a true carbine, then a bullpup battle rifle, then a 30 round plinker gun, then a combat shotgun... etc. Clearly KT's plan was to have a gun in every category of self-defense related armament, right? So how is this any different? The R9 is a pocket gun. The R45 will be a belt gun. The next Rohrbaugh model may be a full-size single action 1911, right?
I don't think any of this is willy-nilly. If it turns out they just can't sell the R45 -- then I will chalk it up to a miscalculation on their part. But feedback from the SHOT Show (even with full knowlede of the price range) was very positive.
So, I don't think anything was botched. As for Arne Boberg, I met him briefly but do not know him. I applaud his innovation. However, I think its a little too early to decide whether the Boberg company is a success or not.