There is a fringe of architects in Silicon valley (and elsewhere!) who think that computer security is feasible.
There is an even smaller fringe who think a useful subgoal is possible in the fairly short term—a few years.
This is not a Manhattan project.
The kindling is there to start a fire; it needs to be organized, and incidentally funded.
Caveats: (negative bullets)
There is some mixing of ideas to be done.
The path forward is there, but forked.
There is considerable invention to be done, of a novel but not a fundamental sort.
It is the sort of invention that any programmer does when confronted with a novel problem.
Programmers will find this novel because they are not accustomed to having the tools to solve such problems.
The tools exist but are not suitably deployed.
Such products will not be widely sought after by the typical iPhone customer.
Apple won’t put this in all their phones, at least at first.