Don't you worry about your cascades Shannon, they will come back in, probably sooner than you think, styles go in circles with twists here and there. Young brides haven't been around long enough to know cascades exist let alone know what they are, especially since most of the bridal books show only posies, we just have to make them aware there is life beyond.
Somewhere you mentioned cascades on handties, we had 2 this year, more of a teardrop handtie, but never the less not the standard posy, one had orchid whips for long trails, flowers in the cascade part were wired and taped.
Haven't done a bouquet holder in years, in UK we did tons of cascades, which was only few years back, and lots and lots of wired and taped bouquets, lovely and traily, loads of casas and callas, popular.
Imo, handles and backs should always finished, cover all mechanics, the plastic holders feel awful to hold, especially with sweaty palms.
With so many different choices of handle finishes we can create, it may be worth including photos in your portfolio of handle finishes alone, (brides/clients generally don't have the minds eye, they need the visuals) and this is of course a chance to upsell with more luxurious quality (and naturally pricier) ribbons etc.
As for armatures, love them, sell them sometimes but not everyone's cup of tea.
My md wedding was on an armature of weeping willow, just a round woven type base, with a wire base into which I handtied a dome of flowers. Plenty out there that want to be different, only takes a suggestion and a show and tell of 'other' things you are capable of doing. If not for weddings, they are great to use on larger hand-tied bouquets or in corporate work, great upsell, well worth knowing how to do them and have a play with. I also like armatures out of wire, or wire used as bases for all types of things.