Well, my understanding (which may well be wrong or incomplete) is that the Higgs field is indeed tangible:the “drag” of particles moving through the field gives rise to what we perceive as mass, and it seems reasonable to think of that as touching. The really weird thing about the Higgs field is that, unlike all the other “force fields”, it contains zero energy when the strength of the field is non-zero.
I think that people have alternate “linchpins” for the standard model if the Higgs field/boson does not exist and, of course, there is also the possibility that nobody has formulated the “true” theory yet. I know that there are theories that involve more than one Higgs boson, but I don’t know anything more than that about them.
I confess that I don’t know how string theory and the Higgs boson relate to each other. I’ve fallen somewhat behind on string theory …
Fascinating thought his is, I’m going into hiatus for the next week; I’ll be on a beach on St. Johns. Perhaps we can resume in a week
jrf