...The only clear advantage of a striker fired gun is a hammer that won’t get snagged.
Well, there is lower bore axis and simpler manual of arms, to name two, but it might be worth making a distinction about what purpose a gun may serve. Police and military contracts go to striker guns due to that 'simpler manual of arms', and Mike's remark about cost.
Competitive shooters tend more toward hammer guns, due to their better triggers, depending, too, on the form of competition. Strikers dominate in some instances.
The problems with DA/SA pistols have been noted...if simply managing suspects at gunpoint is the goal, the long pull on the first shot may have some merit, but the sudden transition, under stress, can be a challenge.
Personally, I'm not that smart, and striker guns (and their consistent, deliberate triggers) are what I'd want when things go sideways.
As regards the original question, I'm doubtful that Walther, or anyone else, will do a 'clean piece of paper' hammer gun. Existing designs (the 1911 especially) will continue to see sales, but the poly strikers are the future.
Moon
ETA- Blitz, get that damned (but neat!) Webley out of here!

M