Perhaps the novella needs re-branding. The word 'novella' suggests (to me) something inferior to a real novel, along the line of a Harlequin romance. If the genre could be re-invented with a different name, (here insert ideas) it may become more popular to the reading public and the publishing industry. I can visualize an entire section in Chapters/Indigo proclaiming these mini-novels or offered for a less expensive price as e-books.
You have a knack for putting your finger where it hurts. "Novella" has a pejorative echo; its sounds like something that didn't pass muster as a novel and was demoted.In general terms, a novella uses half the space in terms of pages and word-count than a standard novel. Consequently, it leaves little room for vagaries and for-the-hell-of-it description.Go on, I dare you, write one.