Genetic modification is the chick that can't be put back into the potato and we're only going to see more of it in the pet trade from simple hacks to cross-species mingling. Innovative breeders, looking to protect their market, will move past patent protection and breeding laws and work to create hormonal or genetic breeding inhibiters--it'd suck for the hobbyist breeder, but be a god-send for folks wanting to keep live bearers without dealing with unending fry.
Barring a zombie apocalypse technology is only going to accelerate--lighting the easiest target and I could easily see combined systems that test your water, scan the glass for algae build-up, check nutrient levels and adjust your light/ferts/c02 in an all in one self-monitoring system. And with so many homes having huge windows--why not tank glass that automatically darkens to block sunlight as needed? Personally, I'd love to see an all-in-one auto filter/heater/chiller. Or algae eating nano-bots. That would be amazing.
On the consumer side, we're increasingly moving to a culture that consumes rather than produces. Shows like Tanked are leading the way with folks wanting the splendor of a great tank full of fish, without having to do any of the work. Advances in materials bring down costs, widen options for installing and servicing enormous tanks and, though we've seen average home sizes fall slightly, homes are still being built massively larger than needed even as we see average household size decrease. Big spaces cry out for big tanks and excess space makes it easier to give up room for dedicated service areas. We may yet see aquarium tenders become as commonplace as swimming pool cleaners.