I can't say I agree with the parallels you draw here on disruption. This isn't disruption comparable to Uber or AirBnB, it isn't disruption at all. The examples you give are all companies which have come along and provided an offering on par with or exceeding what is currently being offered by archaic slow moving industries, often both in price and experience.
Uber works because the service you receive is a commodity service - transport. Uber fixes the price across all car tier's so it doesn't matter wether you get Larry or Jim, you're paying the same, their job is to get you from point A to point B. There's essentially no qualitative differentiation. What they offer isn't cheaper than a cab but the experience they offer is arguably superior and more convenient. This works and is disruptive. What AirBnB offer is a platform to connect people with spare beds, with people who want a place to stay. The qualitative offering differs from host to host, and as a result, AirBnB allow Hosts to set their own price per night, so essentially making AirBnB a platform conecting people, but allowing a free market to operate upon it. The end experience is unique, and mostly cheaper than the equivalent experience at a hotel. This works, this is disruptive.
What Fiverr are doing is offering a highly inferior service at a much lower price. They are taking a service which is not a commodity good, one with a huge spectrum of qualitative differentiation, and fixing it at a very low price. When you do that you just get a bad product bought cheap. That is not new, let alone disruptive.
The differentiator between Fiverr design product and a good quality professional designer, isn't that they don't offer the 'bells and whistles'. A 'professional', reputable designer isn't trying to upsell you on the scotch guard for your sofa to make an extra buck or two - pantone references and vector artwork aren't line items on an invoice in design, that's not what you're paying for. The gap is the quality of the final product. This isn't people offering high quality design and somehow making it a leaner, more compelling offering than traditional channels using some kind of an innovative model - this is just poor quality work pedalled on a platform.
Not everyone is prepared to pay for 'good' design. Some people just want 'something'. And there will always be those people. That both want just something, and those that produce it. That pool of people, and the rest, which need, and understand the value of good design aren't in conflict. They're totally separate groups, and they've co existed for years, and will continue to.
I can confidently say that Fiverr will not make me, or any designers I know 'think about the way we sell our services' in the manner you suggest.