David: SNAP. Exactly the same situation here - love the convenience of the umbrella-opening form, loathe the collapsing-rib-syndrome. I did something about it, I ordered one of the Mk II Phottix Octas which is described by them as having fibreglass ribs (the Octa is the only one they actually mention as having the fibreglass ribs - I checked. Thoroughly). I saw with some glee last night that it was placed on the local van for delivery this morning, so currently jumping about with anticipation.
The price of the Westcott in the UK puts them way beyond realistic for what they are, it's more like catheterisation (ie. taking the p*ss) than pricing to sell. I've heard so many tales of Westcott's offering also collapsing that I'm not prepared to spend US$239 to find if they are true.
Once this has arrived (without the rather puerile video of person-unwrapping-gear-and-calling-it-a-"review"), one of my thoughts was using the principle to modify subsequent softboxes with fibreglass. A preliminary idea was, coincidentally to J.Doe's post, to get one of those rather nice looking umbrellas from Trevor at Cotswold Photo
and using the frame to modify an otherwise satisfactory box. 16 fibreglass ribs paired up to make the 8 required may solve the problem. Strange that we've taken a very old design of an essentially disposable article (the bent metal umbrella frame), accepted it's faults and foibles by placing it under far greater stress than was ever intended and only now seek to make it fit for purpose. "If it ain't broke, don't fix it" may be a sound principle, but when it is broke(n)..........
I tried 'splinting' existing ribs, either with piano wire inside the 'U' shape (which doesn't support the actual point of collapse) or fibreglass alongside it (which additionally stretches the covering material). Neither was especially successful as they both place additional stress on all the little joints with the added tension - simply shifts the failure zone from rib to joint. We shall see what can be done with a bit of wit, ingenuity and the engineer's best friend, the big 'ammer. 