Now, that is an interesting question to ponder. It brings to mind an old saw from aviation: How do you make a small fortune in aviation? Answer: Start out with a large one! I think you see the possible relation to manufacturing decks again. But I don't think the outlook is without a ray of hope. Read on.
Where the demand is perceived, someone usually fills it: While the numbers of companies manufacturing turntables is shrinking, McIntosh Labs has brought out a new, very high-end, turntable. No doubt for a breathtaking price.
Most of the companies that produced the majority of the decks we all love, Pioneer, Teac, Sony, even Revox/Studer were, to varying degrees, concerned about the price of their products. None of them ever catered to a cost-be-damned clientele. None of these companies have changed much, if any, in that respect. Thus I don't look to any of them to re-introduce decks anytime soon. Unless the demand begins to rise again. And that is where the glimmer of hope begins to shine.
Over the past few years I have noticed that no one who was hanging on to analog has dropped it and, for lack of a better expression, "gone digital." In fact it seems that I am meeting more and more people who are at least unwilling to give up analog, whether it be vinyl or tape, some who are turning back to analog, and even some youth who are discovering the incredible, real and full sound of analog for the first time.
Somehow, someway, there seems to be a small quiet return to analog beginning to happen, and maybe all we need to do is gently fan the flames and help it grow. Maybe, then we'll see new decks arriving. And, just imagine the level of their performance with the technology that has been developed in the past 20 years, roughly since the last decks were designed! They'd blow digital right out of the way. The only downside I can see is that, at least in the beginning, any new decks are not going to be as "affordable" as they were back in the old stereo era. Not that the better ones were ever really "affordable" by most of us.